Biomass (energy)

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Wood pellets-small huddle PNrdeg0108.jpg
Wood pellets is an example of biomass used for bioenergy production, usually for heating purposes.
Miscanthus Bestand.JPG
Miscanthus × giganteus, a perennial grass, can also be used for bioenergy production.

In the context of energy production, biomass is matter from recently living (but now dead) organisms which is used for bioenergy production. Examples include wood, wood residues, energy crops, agricultural residues including straw, and organic waste from industry and households. [1] Wood and wood residues is the largest biomass energy source today. Wood can be used as a fuel directly or processed into pellet fuel or other forms of fuels. Other plants can also be used as fuel, for instance maize, switchgrass, miscanthus and bamboo. [2] The main waste feedstocks are wood waste, agricultural waste, municipal solid waste, and manufacturing waste. Upgrading raw biomass to higher grade fuels can be achieved by different methods, broadly classified as thermal, chemical, or biochemical.

Contents

The climate impact of bioenergy varies considerably depending on where biomass feedstocks come from and how they are grown. [3] For example, burning wood for energy releases carbon dioxide. Those emissions can be significantly offset if the trees that were harvested are replaced by new trees in a well-managed forest, as the new trees will remove carbon dioxide from the air as they grow. [4] However, the farming of biomass feedstocks can reduce biodiversity, degrade soils and take land out of food production. [5] It may also consume water for irrigation and fertilisers. [6] [7]

Terminology

Biomass (in the context of energy generation) is matter from recently living (but now dead) organisms which is used for bioenergy production. There are variations in how such biomass for energy is defined, e.g. only from plants, [8] or from plants and algae, [9] or from plants and animals. [10] The vast majority of biomass used for bioenergy does come from plants. Bioenergy is a type of renewable energy with potential to assist with climate change mitigation. [11]

Some people use the terms biomass and biofuel interchangeably, but it is now more common to consider biofuel to be a liquid or gaseous fuel used for transportation, as defined by government authorities in the US and EU. [lower-alpha 1] [lower-alpha 2] From that perspective, biofuel is a subset of biomass.

The European Union's Joint Research Centre defines solid biofuel as raw or processed organic matter of biological origin used for energy, such as firewood, wood chips, and wood pellets. [12] : 20–21 

Types and uses

Different types of biomass are used for different purposes:

Biomass is categorized either as biomass harvested directly for energy (primary biomass), or as residues and waste: (secondary biomass). [13] [14]

Biomass harvested directly for energy

The main biomass types harvested directly for energy is wood, some food crops and all perennial energy crops. One third of the global forest area of 4 billion hectares is used for wood production or other commercial purposes, [15] and forests provide 85% of all biomass used for energy globally. [16] : 3  In the EU, forests provide 60% of all biomass used for energy, [17] with wood residues and waste being the largest source. [18]

Woody biomass used for energy often consists of trees and bushes harvested for traditional cooking and heating purposes, particularly in developing countries, with 25 EJ per year used globally for these purposes. [19] This practice is highly polluting. The World Health Organization (WHO) estimates that cooking-related pollution causes 3.8 million annual deaths. [20] The United Nations Sustainable Development Goal 7 aims for the traditional use of biomass for cooking to be phased out by 2030. [21] Short-rotation coppices [lower-alpha 3] and short-rotation forests [lower-alpha 4] are also harvested directly for energy, providing 4 EJ of energy, [19] and are considered sustainable. The potential for these crops and perennial energy crops to provide at least 25 EJ annually by 2050 is estimated. [19] [lower-alpha 5]

Food crops harvested for energy include sugar-producing crops (such as sugarcane), starch-producing crops (such as maize), and oil-producing crops (such as rapeseed). [22] Sugarcane is a perennial crop, while corn and rapeseed are annual crops. Sugar- and starch-producing crops are used to make bioethanol, and oil-producing crops are used to make biodiesel. The United States is the largest producer of bioethanol, while the European Union is the largest producer of biodiesel. [23] The global production of bioethanol and biodiesel provides 2.2 and 1.5 EJ of energy per year, respectively. [24] Biofuel made from food crops harvested for energy is also known as "first-generation" or "traditional" biofuel and has relatively low emission savings.

The IPCC estimates that between 0.32 and 1.4 billion hectares of marginal land are suitable for bioenergy worldwide. [lower-alpha 6]

Biomass in the form of residues and waste

Residues and waste are by-products from biological material harvested mainly for non-energy purposes. The most important by-products are wood residues, agricultural residues and municipal/industrial waste:

Wood residues are by-products from forestry operations or from the wood processing industry. Had the residues not been collected and used for bioenergy, they would have decayed (and therefore produced emissions) [lower-alpha 7] on the forest floor or in landfills, or been burnt (and produced emissions) at the side of the road in forests or outside wood processing facilities. [25]

Sawdust is residue from the wood processing industry. Lake Stevens, WA - de Jong Sawdust & Shavings 01.jpg
Sawdust is residue from the wood processing industry.

The by-products from forestry operations are called logging residues or forest residues, and consist of tree tops, branches, stumps, damaged or dying or dead trees, irregular or bent stem sections, thinnings (small trees that are cleared away in order to help the bigger trees grow large), and trees removed to reduce wildfire risk. [lower-alpha 8] The extraction level of logging residues differ from region to region, [lower-alpha 9] [lower-alpha 10] but there is an increasing interest in using this feedstock, [lower-alpha 11] since the sustainable potential is large (15 EJ annually). [lower-alpha 12] 68% of the total forest biomass in the EU consists of wood stems, and 32% consists of stumps, branches and tops. [26]

The by-products from the wood processing industry are called wood processing residues and consist of cut offs, shavings, sawdust, bark, and black liquor. [27] Wood processing residues have a total energy content of 5.5 EJ annually. [28] Wood pellets are mainly made from wood processing residues, [lower-alpha 13] and have a total energy content of 0.7 EJ. [lower-alpha 14] Wood chips are made from a combination of feedstocks, [29] and have a total energy content of 0.8 EJ. [lower-alpha 15]

The energy content in agricultural residues used for energy is approximately 2 EJ. [lower-alpha 16] However, agricultural residues has a large untapped potential. The energy content in the global production of agricultural residues has been estimated to 78 EJ annually, with the largest share from straw (51 EJ). [lower-alpha 17] Others have estimated between 18 and 82 EJ. [lower-alpha 18] The use of agricultural residues and waste that is both sustainable and economically feasible [13] : 9  is expected to increase to between 37 and 66 EJ in 2030. [lower-alpha 19]

Municipal waste produced 1.4 EJ and industrial waste 1.1 EJ. [30] Wood waste from cities and industry also produced 1.1 EJ. [28] The sustainable potential for wood waste has been estimated to 2–10 EJ. [31] IEA recommends a dramatic increase in waste utilization to 45 EJ annually in 2050. [32]

Biomass conversion

Raw biomass can be upgraded into better and more practical fuel simply by compacting it (e.g. wood pellets), or by different conversions broadly classified as thermal, chemical, and biochemical. [33] Biomass conversion reduces the transport costs as it is cheaper to transport high density commodities. [13] : 53 

Thermal conversion

Thermal upgrading produces solid, liquid or gaseous fuels, with heat as the dominant conversion driver. The basic alternatives are torrefaction, pyrolysis, and gasification, these are separated principally by how far the chemical reactions involved are allowed to proceed. The advancement of the chemical reactions is mainly controlled by how much oxygen is available, and the conversion temperature.

Torrefaction is a mild form of pyrolysis where organic materials are heated to 400–600 °F (200–300 °C) in a no–to–low oxygen environment. [34] [35] The heating process removes (via gasification) the parts of the biomass that has the lowest energy content, while the parts with the highest energy content remain. That is, approximately 30% of the biomass is converted to gas during the torrefaction process, while 70% remains, usually in the form of compacted pellets or briquettes. This solid product is water resistant, easy to grind, non-corrosive, and it contains approximately 85% of the original biomass energy. [36] Basically the mass part has shrunk more than the energy part, and the consequence is that the calorific value of torrefied biomass increases significantly, to the extent that it can compete with coals used for electricity generation (steam/thermal coals). The energy density of the most common steam coals today is 22–26 GJ/t. [37] There are other less common, more experimental or proprietary thermal processes that may offer benefits, such as hydrothermal upgrading (sometimes called "wet" torrefaction.) [lower-alpha 20] The hydrothermal upgrade path can be used for both low and high moisture content biomass, e.g. aqueous slurries. [38]

Pyrolysis entails heating organic materials to 800–900 °F (400–500 °C) in the near complete absence of oxygen. Biomass pyrolysis produces fuels such as bio-oil, charcoal, methane, and hydrogen. Hydrotreating is used to process bio-oil (produced by fast pyrolysis) with hydrogen under elevated temperatures and pressures in the presence of a catalyst to produce renewable diesel, renewable gasoline, and renewable jet fuel. [39]

Gasification entails heating organic materials to 1,400–1700 °F (800–900 °C) with injections of controlled amounts of oxygen and/or steam into the vessel to produce a carbon monoxide and hydrogen rich gas called synthesis gas or syngas. Syngas can be used as a fuel for diesel engines, for heating, and for generating electricity in gas turbines. It can also be treated to separate the hydrogen from the gas, and the hydrogen can be burned or used in fuel cells. The syngas can be further processed to produce liquid fuels using the Fischer-Tropsch synthesis process. [33] [40]

Chemical conversion

A range of chemical processes may be used to convert biomass into other forms, such as to produce a fuel that is more practical to store, transport and use, or to exploit some property of the process itself. Many of these processes are based in large part on similar coal-based processes, such as the Fischer-Tropsch synthesis. [41] A chemical conversion process known as transesterification is used for converting vegetable oils, animal fats, and greases into fatty acid methyl esters (FAME), which are used to produce biodiesel. [33]

Biochemical conversion

Biochemical processes have developed in nature to break down the molecules of which biomass is composed, and many of these can be harnessed. In most cases, microorganisms are used to perform the conversion. The processes are called anaerobic digestion, fermentation, and composting. [42]

Fermentation converts biomass into bioethanol, and anaerobic digestion converts biomass into renewable natural gas (biogas). Bioethanol is used as a vehicle fuel. Renewable natural gas—also called biogas or biomethane—is produced in anaerobic digesters at sewage treatment plants and at dairy and livestock operations. It also forms in and may be captured from solid waste landfills. Properly treated renewable natural gas has the same uses as fossil fuel natural gas. [33]

Climate impacts

This section is an excerpt from Sustainable energy § Bioenergy.[ edit ]

The climate impact of bioenergy varies considerably depending on where biomass feedstocks come from and how they are grown. [43] For example, burning wood for energy releases carbon dioxide; those emissions can be significantly offset if the trees that were harvested are replaced by new trees in a well-managed forest, as the new trees will absorb carbon dioxide from the air as they grow. [44] However, the establishment and cultivation of bioenergy crops can displace natural ecosystems, degrade soils, and consume water resources and synthetic fertilisers. [6] [7]

Approximately one-third of all wood used for traditional heating and cooking in tropical areas is harvested unsustainably. [45] Bioenergy feedstocks typically require significant amounts of energy to harvest, dry, and transport; the energy usage for these processes may emit greenhouse gases. In some cases, the impacts of land-use change, cultivation, and processing can result in higher overall carbon emissions for bioenergy compared to using fossil fuels. [7] [46]

Use of farmland for growing biomass can result in less land being available for growing food. In the United States, around 10% of motor gasoline has been replaced by corn-based ethanol, which requires a significant proportion of the harvest. [47] [48] In Malaysia and Indonesia, clearing forests to produce palm oil for biodiesel has led to serious social and environmental effects, as these forests are critical carbon sinks and habitats for diverse species. [49] [50] Since photosynthesis captures only a small fraction of the energy in sunlight, producing a given amount of bioenergy requires a large amount of land compared to other renewable energy sources. [51]

Short-term vs long-term climate benefits

Regarding the issue of climate consequences for modern bioenergy, IPCC states: "Life-cycle GHG emissions of modern bioenergy alternatives are usually lower than those for fossil fuels." [52] Consequently, most of IPCC's GHG mitigation pathways include substantial deployment of bioenergy technologies. [53]

Some research groups state that even if the European and North American forest carbon stock is increasing, it simply takes too long for harvested trees to grow back. Bioenergy from sources with high payback and parity times take a long time to have an impact on climate change mitigation. They therefore suggest that the EU should adjust its sustainability criteria so that only renewable energy with carbon payback times of less than 10 years is defined as sustainable, [lower-alpha 21] for instance wind, solar, biomass from wood residues and tree thinnings that would otherwise be burnt or decompose relatively fast, and biomass from short rotation coppicing (SRC). [54]

The IPCC states: "While individual stands in a forest may be either sources or sinks, the forest carbon balance is determined by the sum of the net balance of all stands." [55] IPCC also state that the only universally applicable approach to carbon accounting is the one that accounts for both carbon emissions and carbon removals (absorption) for managed lands (e.g. forest landscapes.) [56] : 2.67  When the total is calculated, natural disturbances like fires and insect infestations are subtracted, and what remains is the human influence. [lower-alpha 22]

IEA Bioenergy state that an exclusive focus on the short-term make it harder to achieve efficient carbon mitigation in the long term, and compare investments in new bioenergy technologies with investments in other renewable energy technologies that only provide emission reductions after 2030, for instance the scaling-up of battery manufacturing or the development of rail infrastructure. [lower-alpha 23] Forest carbon emission avoidance strategies give a short-term mitigation benefit, but the long-term benefits from sustainable forestry activities provide ongoing forest product and energy resources. [55]

Most of IPCC's GHG mitigation pathways include substantial deployment of bioenergy technologies. [53] Limited or no bioenergy pathways leads to increased climate change or shifting bioenergy's mitigation load to other sectors. [lower-alpha 24] In addition, mitigation cost increases. [lower-alpha 25]

Carbon accounting system boundaries

Carbon positive scenarios are likely to be net emitters of CO2, carbon negative projects are net absorbers of CO2, while carbon neutral projects balance emissions and absorption equally. [57]

It is common to include alternative scenarios (also called "reference scenarios" or "counterfactuals") for comparison. [12] : 83  The alternative scenarios range from scenarios with only modest changes compared to the existing project, all the way to radically different ones (i.e. forest protection or "no-bioenergy" counterfactuals.) Generally, the difference between scenarios is seen as the actual carbon mitigation potential of the scenarios. [12] : 100 

Alternative system boundaries for assessing climate effects of forest-based bioenergy. Option 1 (black) considers only the stack emissions; Option 2 (green) considers only the forest carbon stock; Option 3 (blue) considers the bioenergy supply chain; Option 4 (red) covers the whole bioeconomy, including wood products in addition to biomass. Bioenergy system boundaries.jpg
Alternative system boundaries for assessing climate effects of forest-based bioenergy. Option 1 (black) considers only the stack emissions; Option 2 (green) considers only the forest carbon stock; Option 3 (blue) considers the bioenergy supply chain; Option 4 (red) covers the whole bioeconomy, including wood products in addition to biomass.

In addition to the choice of alternative scenario, other choices has to be made as well. The so-called "system boundaries" determine which carbon emissions/absorptions that will be included in the actual calculation, and which that will be excluded. System boundaries include temporal, spatial, efficiency-related and economic boundaries. [27]

For example, the actual carbon intensity of bioenergy varies with biomass production techniques and transportation lengths.

Temporal system boundaries

The temporal boundaries define when to start and end carbon counting. Sometimes "early" events are included in the calculation, for instance carbon absorption going on in the forest before the initial harvest. Sometimes "late" events are included as well, for instance emissions caused by end-of-life activities for the infrastructure involved, e.g. demolition of factories. Since the emission and absorption of carbon related to a project or scenario changes with time, the net carbon emission can either be presented as time-dependent (for instance a curve which moves along a time axis), or as a static value; this shows average emissions calculated over a defined time period.

The time-dependent net emission curve will typically show high emissions at the beginning (if the counting starts when the biomass is harvested.) Alternatively, the starting point can be moved back to the planting event; in this case the curve can potentially move below zero (into carbon negative territory) if there is no carbon debt from land use change to pay back, and in addition more and more carbon is absorbed by the planted trees. The emission curve then spikes upward at harvest. The harvested carbon is then being distributed into other carbon pools, and the curve moves in tandem with the amount of carbon that is moved into these new pools (Y axis), and the time it takes for the carbon to move out of the pools and return to the forest via the atmosphere (X axis). As described above, the carbon payback time is the time it takes for the harvested carbon to be returned to the forest, and the carbon parity time is the time it takes for the carbon stored in two competing scenarios to reach the same level. [lower-alpha 26]

The static carbon emission value is produced by calculating the average annual net emission for a specific time period. The specific time period can be the expected lifetime of the infrastructure involved (typical for life cycle assessments; LCA's), policy relevant time horizons inspired by the Paris agreement (for instance remaining time until 2030, 2050 or 2100), [58] time spans based on different global warming potentials (GWP; typically 20 or 100 years), [lower-alpha 27] or other time spans. In the EU, a time span of 20 years is used when quantifying the net carbon effects of a land use change. [lower-alpha 28] Generally in legislation, the static number approach is preferred over the dynamic, time-dependent curve approach. The number is expressed as a so-called "emission factor" (net emission per produced energy unit, for instance kg CO2e per GJ), or even simpler as an average greenhouse gas savings percentage for specific bioenergy pathways. [lower-alpha 29] The EU's published greenhouse gas savings percentages for specific bioenergy pathways used in the Renewable Energy Directive (RED) and other legal documents are based on life cycle assessments (LCA's). [lower-alpha 30] [lower-alpha 31]

Spatial system boundaries

The spatial boundaries define "geographical" borders for carbon emission/absorption calculations. The two most common spatial boundaries for CO2 absorption and emission in forests are 1.) along the edges of a particular forest stand and 2.) along the edges of a whole forest landscape, which include many forest stands of increasing age (the forest stands are harvested and replanted, one after the other, over as many years as there are stands.) A third option is the so-called increasing stand level carbon accounting method. The researcher has to decide whether to focus on the individual stand, an increasing number of stands, or the whole forest landscape. The IPCC recommends landscape-level carbon accounting.

Further, the researcher has to decide whether emissions from direct/indirect land use change should be included in the calculation. Most researchers include emissions from direct land use change, for instance the emissions caused by cutting down a forest in order to start some agricultural project there instead. The inclusion of indirect land use change effects is more controversial, as they are difficult to quantify accurately. [lower-alpha 32] [lower-alpha 33] Other choices involve defining the likely spatial boundaries of forests in the future.

The efficiency-related boundaries define a range of fuel substitution efficiencies for different biomass-combustion pathways. Different supply chains emit different amounts of carbon per supplied energy unit, and different combustion facilities convert the chemical energy stored in different fuels to heat or electrical energy with different efficiencies. The researcher has to know about this and choose a realistic efficiency range for the different biomass-combustion paths under consideration. The chosen efficiencies are used to calculate so-called "displacement factors" – single numbers that shows how efficient fossil carbon is substituted by biogenic carbon. [59] [27] If for instance 10 tonnes of carbon are combusted with an efficiency half that of a modern coal plant, only 5 tonnes of coal would actually be counted as displaced (displacement factor 0.5).

Generally, fuel burned in inefficient (old or small) combustion facilities gets assigned lower displacement factors than fuel burned in efficient (new or large) facilities, since more fuel has to be burned (and therefore more CO2 released) in order to produce the same amount of energy. [27]

The displacement factor varies with the carbon intensity of both the biomass fuel and the displaced fossil fuel. If or when bioenergy can achieve negative emissions (e.g. from afforestation, energy grass plantations and/or bioenergy with carbon capture and storage (BECCS), [32] or if fossil fuel energy sources with higher emissions in the supply chain start to come online (e.g. because of fracking, or increased use of shale gas), the displacement factor will start to rise. On the other hand, if or when new baseload energy sources with lower emissions than fossil fuels start to come online, the displacement factor will start to drop. Whether a displacement factor change is included in the calculation or not, depends on whether or not it is expected to take place within the time period covered by the relevant scenario's temporal system boundaries. [lower-alpha 34]

Economic system boundaries

The economic boundaries define which market effects to include in the calculation, if any. Changed market conditions can lead to small or large changes in carbon emissions and absorptions from supply chains and forests, [27] for instance changes in forest area as a response to changes in demand. Macroeconomic events/policy changes can have impacts on forest carbon stock. [lower-alpha 35] Like with indirect land use changes, economic changes can be difficult to quantify however, so some researchers prefer to leave them out of the calculation. [lower-alpha 36]

System boundary impacts

The chosen system boundaries are very important for the calculated results. [27] Shorter payback/parity times are calculated when fossil carbon intensity, forest growth rate and biomass conversion efficiency increases, or when the initial forest carbon stock and/or harvest level decreases. [60] Shorter payback/parity times are also calculated when the researcher choose landscape level over stand level carbon accounting (if carbon accounting starts at the harvest rather than at the planting event.) Conversely, longer payback/parity times are calculated when carbon intensity, growth rate and conversion efficiency decreases, or when the initial carbon stock and/or harvest level increases, or the researcher choose stand level over landscape level carbon accounting. [lower-alpha 37]

Critics argue that unrealistic system boundary choices are made, [lower-alpha 38] or that narrow system boundaries lead to misleading conclusions. [27] Others argue that the wide range of results shows that there is too much leeway available and that the calculations therefore are useless for policy development. [lower-alpha 39] EU's Join Research Center agrees that different methodologies produce different results, [lower-alpha 40] but also argue that this is to be expected, since different researchers consciously or unconsciously choose different alternative scenarios/methodologies as a result of their ethical ideals regarding man's optimal relationship with nature. The ethical core of the sustainability debate should be made explicit by researchers, rather than hidden away. [lower-alpha 41]

Comparisons of GHG emissions at the point of combustion

GHG emissions per produced energy unit at the point of combustion depend on moisture content in the fuel, chemical differences between fuels and conversion efficiencies. For example, raw biomass can have higher moisture content compared to some common coal types. When this is the case, more of the wood's inherent energy must be spent solely on evaporating moisture, compared to the drier coal, which means that the amount of CO2 emitted per unit of produced heat will be higher. [61]

Many biomass-only combustion facilities are relatively small and inefficient, compared to the typically much larger coal plants. Further, raw biomass (for instance wood chips) can have higher moisture content than coal (especially if the coal has been dried). When this is the case, more of the wood's inherent energy must be spent solely on evaporating moisture, compared to the drier coal, which means that the amount of CO2 emitted per unit produced heat will be higher. This moisture problem can be mitigated by modern combustion facilities. [lower-alpha 42]

Forest biomass on average produces 10-16% more CO2 than coal. [62] : 3  However, focusing on gross emissions misses the point, what counts is the net climate effect from emissions and absorption, taken together. [63] : 386  [62] : 3–4  IEA Bioenergy concludes that the additional CO2 from biomass "[...] is irrelevant if the biomass is derived from sustainably managed forests." [62] : 3 

Climate impacts expressed as varying with time

Time-dependent net emission estimates for forest bioenergy pathways, compared against coal and natural gas alternative scenarios. Plus signs represents positive climate effects, minus signs negative climate effects. Net emissions from forest bioenergy pathways, compared against coal and natural gas alternative scenarios.png
Time-dependent net emission estimates for forest bioenergy pathways, compared against coal and natural gas alternative scenarios. Plus signs represents positive climate effects, minus signs negative climate effects.

The use of boreal stemwood harvested exclusively for bioenergy have a positive climate impact only in the long term, while the use of wood residues have a positive climate impact also in the short to medium term. [lower-alpha 43]

Short carbon payback/parity times are produced when the most realistic no-bioenergy scenario is a traditional forestry scenario where "good" wood stems are harvested for lumber production, and residues are burned or left behind in the forest or in landfills. The collection of such residues provides material which "[...] would have released its carbon (via decay or burning) back to the atmosphere anyway (over time spans defined by the biome's decay rate) [...]." [64] In other words, payback and parity times depend on the decay speed. The decay speed depends on a.) location (because decay speed is "[...] roughly proportional to temperature and rainfall [...]" [65] ), and b.) the thickness of the residues. [lower-alpha 44] Residues decay faster in warm and wet areas, and thin residues decay faster than thick residues. Thin residues in warm and wet temperate forests therefore have the fastest decay, while thick residues in cold and dry boreal forests have the slowest decay. If the residues instead are burned in the no-bioenergy scenario, e.g. outside the factories or at roadside in the forests, emissions are instant. In this case, parity times approach zero. [lower-alpha 45]

Like other scientists, the JRC staff note the high variability in carbon accounting results, and attribute this to different methodologies. [lower-alpha 46] In the studies examined, the JRC found carbon parity times of 0 to 400 years for stemwood harvested exclusively for bioenergy, depending on different characteristics and assumptions for both the forest/bioenergy system and the alternative fossil system, with the emission intensity of the displaced fossil fuels seen as the most important factor, followed by conversion efficiency and biomass growth rate/rotation time. Other factors relevant for the carbon parity time are the initial carbon stock and the existing harvest level; both higher initial carbon stock and higher harvest level means longer parity times. [66] Liquid biofuels have high parity times because about half of the energy content of the biomass is lost in the processing. [lower-alpha 47]

Climate impacts expressed as static numbers

Greenhouse gas emissions from wood pellet production and transport from the US to the EU. GHG emissions from wood pellets burnt for electricity in the EU.png
Greenhouse gas emissions from wood pellet production and transport from the US to the EU.

EU's Joint Research Centre has examined a number of bioenergy emission estimates found in literature, and calculated greenhouse gas savings percentages for bioenergy pathways in heat production, transportation fuel production and electricity production, based on those studies. The calculations are based on the attributional LCA accounting principle. It includes all supply chain emissions, from raw material extraction, through energy and material production and manufacturing, to end-of-life treatment and final disposal. It also includes emissions related to the production of the fossil fuels used in the supply chain. It excludes emission/absorption effects that takes place outside its system boundaries, for instance market related, biogeophysical (e.g. albedo), and time-dependent effects. The authors conclude that "[m]ost bio-based commodities release less GHG than fossil products along their supply chain; but the magnitude of GHG emissions vary greatly with logistics, type of feedstocks, land and ecosystem management, resource efficiency, and technology." [68]

Because of the varied climate mitigation potential for different biofuel pathways, governments and organizations set up different certification schemes to ensure that biomass use is sustainable, for instance the RED (Renewable Energy Directive) in the EU and the ISO standard 13065 by the International Organization for Standardization. [69] In the US, the RFS (Renewables Fuel Standard) limit the use of traditional biofuels and defines the minimum life-cycle GHG emissions that are acceptable. Biofuels are considered traditional if they achieve up to 20% GHG emission reduction compared to the petrochemical equivalent, advanced if they save at least 50%, and cellulosic if the save more than 60%. [lower-alpha 48]

The EU's Renewable Energy Directive (RED) states that the typical greenhouse gas emissions savings when replacing fossil fuels with wood pellets from forest residues for heat production varies between 69% and 77%, depending on transport distance: When the distance is between 0 and 2500 km, emission savings is 77%. Emission savings drop to 75% when the distance is between 2500 and 10 000 km, and to 69% when the distance is above 10 000 km. When stemwood is used, emission savings varies between 70% and 77%, depending on transport distance. When wood industry residues are used, savings varies between 79% and 87%. [lower-alpha 49]

Since the long payback and parity times calculated for some forestry projects is seen as a non-issue for energy crops (except in the cases mentioned above), researchers instead calculate static climate mitigation potentials for these crops, using LCA-based carbon accounting methods. A particular energy crop-based bioenergy project is considered carbon positive, carbon neutral or carbon negative based on the total amount of CO2 equivalent emissions and absorptions accumulated throughout its entire lifetime: If emissions during agriculture, processing, transport and combustion are higher than what is absorbed (and stored) by the plants, both above and below ground, during the project's lifetime, the project is carbon positive. Likewise, if total absorption is higher than total emissions, the project is carbon negative. In other words, carbon negativity is possible when net carbon accumulation more than compensates for net lifecycle greenhouse gas emissions.

Typically, perennial crops sequester more carbon than annual crops because the root buildup is allowed to continue undisturbed over many years. Also, perennial crops avoid the yearly tillage procedures (plowing, digging) associated with growing annual crops. Tilling helps the soil microbe populations to decompose the available carbon, producing CO2. [lower-alpha 50] [63] : 393 

There is now (2018) consensus in the scientific community that "[...] the GHG [greenhouse gas] balance of perennial bioenergy crop cultivation will often be favourable [...]", also when considering the implicit direct and indirect land use changes. [70] : 150 

Albedo and evapotranspiration

This section is an excerpt from Albedo § Trees.[ edit ]
Forests generally have a low albedo because the majority of the ultraviolet and visible spectrum is absorbed through photosynthesis. For this reason, the greater heat absorption by trees could offset some of the carbon benefits of afforestation (or offset the negative climate impacts of deforestation). In other words: The climate change mitigation effect of carbon sequestration by forests is partially counterbalanced in that reforestation can decrease the reflection of sunlight (albedo). [71]

Environmental impacts

The environmental impacts of biomass production need to be taken into account. For instance, in 2022, IEA stated that "bioenergy is an important pillar of decarbonisation in the energy transition as a near zero-emission fuel", and that "more efforts are needed to accelerate modern bioenergy deployment to get on track with the Net Zero Scenario [....] while simultaneously ensuring that bioenergy production does not incur negative social and environmental consequences." [72]

Sustainable forestry and forest protection

Old-growth spruce forest in France. Old growth spruce forest.jpg
Old-growth spruce forest in France.
Plantation forest in Hawaii. Starr-090413-5809-Fraxinus uhdei-plantation-Makawao Forest Reserve-Maui (24655914310).jpg
Plantation forest in Hawaii.
Forest area increase in the EU 1990-2020. Forest area increase in the EU 1990-2020.png
Forest area increase in the EU 1990–2020.

IPCC states that there is disagreement about whether the global forest is shrinking or not, and quote research indicating that tree cover has increased 7.1% between 1982 and 2016. [63] : 367  The IPCC writes: "While above-ground biomass carbon stocks are estimated to be declining in the tropics, they are increasing globally due to increasing stocks in temperate and boreal forests [...]." [63] : 385 

Old trees have a very high carbon absorption rate, and felling old trees means that this large potential for future carbon absorption is lost. [61] : 3  There is also a loss of soil carbon due to the harvest operations. [61] : 3 

Old trees absorb more CO2 than young trees because of the larger leaf area in full-grown trees. [74] However, the old forest (as a whole) will eventually stop absorbing CO2 because CO2 emissions from dead trees cancel out the remaining living trees' CO2 absorption. [lower-alpha 51] The old forest (or forest stands) are also vulnerable for natural disturbances that produces CO2. The IPCC found that "[...] landscapes with older forests have accumulated more carbon but their sink strength is diminishing, while landscapes with younger forests contain less carbon but they are removing CO2 from the atmosphere at a much higher rate [...]." [63] : 386 

The IPCC states that the net climate effect from conversion of unmanaged to managed forest can be positive or negative, depending on circumstances. The carbon stock is reduced, but since managed forests grow faster than unmanaged forests, more carbon is absorbed. Positive climate effects are produced if the harvested biomass is used efficiently. [63] : 351  There is a tradeoff between the benefits of having a maximized forest carbon stock, not absorbing any more carbon, and the benefits of having a portion of that carbon stock "unlocked", and instead working as a renewable fossil fuel replacement tool, for instance in sectors which are difficult or expensive to decarbonize. [32] [lower-alpha 52]

The "competition" between locked-away and unlocked forest carbon might be won by the unlocked carbon: "In the long term, using sustainably produced forest biomass as a substitute for carbon-intensive products and fossil fuels provides greater permanent reductions in atmospheric CO2 than preservation does." [75] : 39 

IEA Bioenergy writes: "forests managed for producing sawn timber, bioenergy and other wood products can make a greater contribution to climate change mitigation than forests managed for conservation alone." Three reasons are given: [76]

  1. reducing ability to act as a carbon sink when the forest matures.
  2. Wood products can replace other materials that emitted more GHGs during production.
  3. "Carbon in forests is vulnerable to loss through natural events such as insect infestations or wildfires"

Data from FAO show that most wood pellets are produced in regions dominated by sustainably managed forests, such as Europe and North America. Europe (including Russia) produced 54% of the world's wood pellets in 2019, and the forest carbon stock in this area increased from 158.7 to 172.4 Gt between 1990 and 2020. In the EU, above-ground forest biomass increases with 1.3% per year on average, however the increase is slowing down because the forests are maturing. [77]

United Kingdom Emissions Trading System allows operators of CO2 generating installations to apply zero emissions factor for the fraction used for non-energy purposes, while energy purposes (electricity generation, heating) require additional sustainability certification on the biomass used. [78]

Sankey diagram that shows the flow of biomass from forest to wood products, paper and energy in Sweden. Forest biomass flow chart.jpg
Sankey diagram that shows the flow of biomass from forest to wood products, paper and energy in Sweden.

Biodiversity

Classification scheme for win-win (green), trade-off (orange), and lose-lose (red) scenarios caused by additional bioenergy pathways in the EU. Carbon emissions and biodiversity.png
Classification scheme for win-win (green), trade-off (orange), and lose-lose (red) scenarios caused by additional bioenergy pathways in the EU.
Short term climate and biodiversity impacts for 3 alternative bioenergy pathways in the EU (forest residues, afforestation and conversion to forest plantation.) Short term is here defined as a period of 0-20 years, medium term 30-50 years, and long term over 50 years. Climate and biodiversity impacts for additional bioenergy pathways in the EU (forestry residues, afforestation and conversion to forest plantation).png
Short term climate and biodiversity impacts for 3 alternative bioenergy pathways in the EU (forest residues, afforestation and conversion to forest plantation.) Short term is here defined as a period of 0–20 years, medium term 30-50 years, and long term over 50 years.

Biomass production for bioenergy can have negative impacts on biodiversity. [5] Oil palm and sugar cane are examples of crops that have been linked to reduced biodiversity. [80] In addition, changes in biodiversity also impacts primary production which naturally effects decomposition and soil heterotrophic organisms. [81]

Win-win scenarios (good for climate, good for biodiversity) include: [12] : 8–149 

Win-lose scenarios (good for the climate, bad for biodiversity) include afforestation on ancient, biodiversity-rich grassland ecosystems which were never forests, and afforestation of former agricultural land with monoculture plantations. [12] : 125–147 

Lose-win scenarios (bad for the climate, good for biodiversity) include natural forest expansion on former agricultural land. [12] : 125–147 

Lose-lose scenarios include increased use of thick forest residues like stumps from some boreal forests with slow decay rates, and conversion of natural forests into forest plantations. [12] : 8–147 

Pollution

Simple traditional use of biomass for cooking or heating (combustion of wood logs). Montana 16 bg 062406.jpg
Simple traditional use of biomass for cooking or heating (combustion of wood logs).

Other problems are pollution of soil and water from fertiliser/pesticide use, [83] and emission of ambient air pollutants, mainly from open field burning of residues. [84]

The traditional use of wood in cook stoves and open fires produces pollutants, which can lead to severe health and environmental consequences. However, a shift to modern bioenergy contribute to improved livelihoods and can reduce land degradation and impacts on ecosystem services. [63] : 375  According to the IPCC, there is strong evidence that modern bioenergy have "large positive impacts" on air quality. [85] Traditional bioenergy is inefficient and the phasing out of this energy source has both large health benefits and large economic benefits. [32] When combusted in industrial facilities, most of the pollutants originating from woody biomass reduce by 97-99%, compared to open burning. [86] Combustion of woody biomass produces lower amounts of particulate matter than coal for the same amount of electricity generated. [87]

See also

Related Research Articles

<span class="mw-page-title-main">Biofuel</span> Type of biological fuel

Biofuel is a fuel that is produced over a short time span from biomass, rather than by the very slow natural processes involved in the formation of fossil fuels such as oil. Biofuel can be produced from plants or from agricultural, domestic or industrial biowaste. Biofuels are mostly used for transportation, but can also be used for heating and electricity. Biofuels are regarded as a renewable energy source. The use of biofuel has been subject to criticism regarding the "food vs fuel" debate, varied assessments of their sustainability, and possible deforestation and biodiversity loss as a result of biofuel production.

<span class="mw-page-title-main">Solid fuel</span> Solid material that can be burnt to release energy

Solid fuel refers to various forms of solid material that can be burnt to release energy, providing heat and light through the process of combustion. Solid fuels can be contrasted with liquid fuels and gaseous fuels. Common examples of solid fuels include wood, charcoal, peat, coal, hexamine fuel tablets, dry dung, wood pellets, corn, wheat, rice, rye, and other grains. Solid fuels are extensively used in rocketry as solid propellants. Solid fuels have been used throughout human history to create fire and solid fuel is still in widespread use throughout the world in the present day.

<span class="mw-page-title-main">Sustainable energy</span> Energy that responsibly meets social, economic, and environmental needs

Energy is sustainable if it "meets the needs of the present without compromising the ability of future generations to meet their own needs." Definitions of sustainable energy usually look at its effects on the environment, the economy, and society. These impacts range from greenhouse gas emissions and air pollution to energy poverty and toxic waste. Renewable energy sources such as wind, hydro, solar, and geothermal energy can cause environmental damage but are generally far more sustainable than fossil fuel sources.

<span class="mw-page-title-main">Bioenergy</span> Renewable energy made from biomass

Bioenergy is a type of renewable energy that is derived from plants and animal waste. The biomass that is used as input materials consists of recently living organisms, mainly plants. Thus, fossil fuels are not regarded as biomass under this definition. Types of biomass commonly used for bioenergy include wood, food crops such as corn, energy crops and waste from forests, yards, or farms.

<span class="mw-page-title-main">Climate change mitigation</span> Actions to reduce net greenhouse gas emissions to limit climate change

Climate change mitigation (or decarbonisation) is action to limit the greenhouse gases in the atmosphere that cause climate change. Climate change mitigation actions include conserving energy and replacing fossil fuels with clean energy sources. Secondary mitigation strategies include changes to land use and removing carbon dioxide (CO2) from the atmosphere. Current climate change mitigation policies are insufficient as they would still result in global warming of about 2.7 °C by 2100, significantly above the 2015 Paris Agreement's goal of limiting global warming to below 2 °C.

<span class="mw-page-title-main">Biomass to liquid</span>

Biomass to liquid is a multi-step process of producing synthetic hydrocarbon fuels made from biomass via a thermochemical route.

<span class="mw-page-title-main">Pellet fuel</span> Solid fuel made from compressed organic material

Pellet fuels are a type of solid fuel made from compressed organic material. Pellets can be made from any one of five general categories of biomass: industrial waste and co-products, food waste, agricultural residues, energy crops, and untreated lumber. Wood pellets are the most common type of pellet fuel and are generally made from compacted sawdust and related industrial wastes from the milling of lumber, manufacture of wood products and furniture, and construction. Other industrial waste sources include empty fruit bunches, palm kernel shells, coconut shells, and tree tops and branches discarded during logging operations. So-called "black pellets" are made of biomass, refined to resemble hard coal and were developed to be used in existing coal-fired power plants. Pellets are categorized by their heating value, moisture and ash content, and dimensions. They can be used as fuels for power generation, commercial or residential heating, and cooking.

Energy forestry is a form of forestry in which a fast-growing species of tree or woody shrub is grown specifically to provide biomass or biofuel for heating or power generation.

<span class="mw-page-title-main">Energy crop</span> Crops grown solely for energy production by combustion

Energy crops are low-cost and low-maintenance crops grown solely for renewable bioenergy production. The crops are processed into solid, liquid or gaseous fuels, such as pellets, bioethanol or biogas. The fuels are burned to generate electrical power or heat.

Renewable fuels are fuels produced from renewable resources. Examples include: biofuels, Hydrogen fuel, and fully synthetic fuel produced from ambient carbon dioxide and water. This is in contrast to non-renewable fuels such as natural gas, LPG (propane), petroleum and other fossil fuels and nuclear energy. Renewable fuels can include fuels that are synthesized from renewable energy sources, such as wind and solar. Renewable fuels have gained in popularity due to their sustainability, low contributions to the carbon cycle, and in some cases lower amounts of greenhouse gases. The geo-political ramifications of these fuels are also of interest, particularly to industrialized economies which desire independence from Middle Eastern oil.

<i>Miscanthus × giganteus</i> Species of grass

Miscanthus × giganteus, also known as the giant miscanthus, is a sterile hybrid of Miscanthus sinensis and Miscanthus sacchariflorus. It is a perennial grass with bamboo-like stems that can grow to heights of 3–4 metres (13 ft) in one season. Just like Pennisetum purpureum, Arundo donax and Saccharum ravennae, it is also called elephant grass.

<span class="mw-page-title-main">Biomass heating system</span>

Biomass heating systems generate heat from biomass. The systems may use direct combustion, gasification, combined heat and power (CHP), anaerobic digestion or aerobic digestion to produce heat. Biomass heating may be fully automated or semi-automated they may be pellet-fired, or they may be combined heat and power systems.

On April 25, 2006, Executive Order S-06-06, the Bioenergy Action Plan was issued by the then governor of California, Arnold Schwarzenegger, outlining a set of target goals which would establish the increasing use and production of biofuels and biopower for both electricity generation and substitution of natural gas and petroleum within the state of California. The plan asked multiple state agencies to work towards the advancement of biomass programs in California. The order would also help provide statewide environmental protection, mitigation and economic advancement. The plan was passed on July 7, 2006, with progress reports issued in 2007 and 2009.

<span class="mw-page-title-main">Biofuel in Sweden</span> Use of renewable fuels from living organisms in Sweden

Biofuels are renewable fuels that are produced by living organisms (biomass). Biofuels can be solid, gaseous or liquid, which comes in two forms: ethanol and biodiesel and often replace fossil fuels. Many countries now use biofuels as energy sources, including Sweden. Sweden has one of the highest usages of biofuel in all of Europe, at 32%, primarily due to the widespread commitment to E85, bioheating and bioelectricity.

Second-generation biofuels, also known as advanced biofuels, are fuels that can be manufactured from various types of non-food biomass. Biomass in this context means plant materials and animal waste used especially as a source of fuel.

<span class="mw-page-title-main">Renewable energy in Finland</span>

Renewable energy in Finland increased from 34% of the total final energy consumption (TFEC) in 2011 to 48% by the end of 2021, primarily driven by bioenergy (38%), hydroelectric power (6.1%), and wind energy (3.3%). In 2021, renewables covered 53% of heating and cooling, 39% of electricity generation, and 20% of the transport sector. By 2020, this growth positioned Finland as having the third highest share of renewables in TFEC among International Energy Agency (IEA) member countries.

Issues relating to biofuel are social, economic, environmental and technical problems that may arise from biofuel production and use. Social and economic issues include the "food vs fuel" debate and the need to develop responsible policies and economic instruments to ensure sustainable biofuel production. Farming for biofuels feedstock can be detrimental to the environment if not done sustainably. Environmental concerns include deforestation, biodiversity loss and soil erosion as a result of land clearing for biofuels agriculture. While biofuels can contribute to reduction in global carbon emissions, indirect land use change for biofuel production can have the inverse effect. Technical issues include possible modifications necessary to run the engine on biofuel, as well as energy balance and efficiency.

<span class="mw-page-title-main">Bioenergy with carbon capture and storage</span>

Bioenergy with carbon capture and storage (BECCS) is the process of extracting bioenergy from biomass and capturing and storing the carbon dioxide (CO2) that is produced.

<span class="mw-page-title-main">Renewable energy in New Zealand</span>

Approximately 44% of primary energy is from renewable energy sources in New Zealand. Approximately 87% of electricity comes from renewable energy, primarily hydropower and geothermal power.

Bioenergy forms a small part of the Turkish energy sector. There is unrealised potential to generate bioenergy using waste from the country's vast agricultural sector and forest resources. The possibility of expanding biogas, biofuel and bioethanol production and use has been suggested to supplement Turkey's energy needs, reduce dependency on fossil fuel imports and cut greenhouse gas emissions.

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Quotes and comments

  1. ↑ EIA 2021b.
  2. ↑ In EU legislation, biofuel is defined as: "Liquid or gaseous fuel for transport produced from biomass." See European Commission 2018a.
  3. ↑ Forest Research 2022c.
  4. ↑ Forest Research 2022a.
  5. ↑ IEA 2021b, p. 212.
  6. ↑ IPCC 2019c, p. 193.
  7. ↑ IRENA 2014, p. 45.
  8. ↑ JRC 2014, pp. 42–43, table 3.
  9. ↑ Pokharel et al. 2019, p. 543.
  10. ↑ Eggers et al. 2020, p. 2.
  11. ↑ Dahlberg et al. 2011, p. 1220
  12. ↑ van den Born et al. distinguish between logging residues in general and dead wood, with the logging residues potential at 14 EJ, and the dead wood potential at 1 EJ annually. For the logging residues potential, see van den Born et al. 2014, p. 20, table 4.2.
  13. ↑ Wood Resources International 2022.
  14. ↑ Recalculated from a total production of 43678925 tonnes wood pellets (FAO 2020), with 17 GJ/t energy content.
  15. ↑ Recalculated from a total production of 265212933 m3 wood chips (FAO 2020), with 3.1 GJ/m3 energy content.
  16. ↑ WBA 2019, p. 3.
  17. ↑ van den Born et al. 2014, pp. 2–21.
  18. ↑ WBA 2019, p. 3.
  19. ↑ IRENA 2021.
  20. ↑ Smith et al. 2018, pp. 547, 556.
  21. ↑ EASAC 2017, p. 34.
  22. ↑ See IPCC 2006b, p. 1.5.
  23. ↑ IEA Bioenergy 2019, p. 4.
  24. ↑ IPCC 2019e, p. 637.
  25. ↑ IPCC 2019e, p. 638.
  26. ↑ A simplified curve, complete with carbon payback and parity times, is available here: EASAC 2017, p. 23.
  27. ↑ JRC 2014, p. 45.
  28. ↑ European Parliament, Council of the European Union 2018, p. Annex VI.
  29. ↑ See for instance the European Union's official emission savings percentages for different fuels here: European Parliament, Council of the European Union 2018, p. ANNEX VI. Note that these estimates do not include the average net emissions which results from an eventual land use change prior to planting.
  30. ↑ Camia et al. 2018, p. 89.
  31. ↑ Camia et al. 2018, pp. 89–91.
  32. ↑ IPCC 2019i, p. 194.
  33. ↑ See Bird et al. 2010, p. 5, and also Searchinger et al. 2008, pp. 1238–1240 for the original research article.
  34. ↑ JRC 2014, pp. 23, 51–52. Note that the JRC use the term "payback time" in the sense of "parity time" as defined in Carbon accounting principles above. See JRC 2014, p. 16.
  35. ↑ JRC 2014, p. 69.
  36. ↑ See for instance Camia et al. 2021, pp. 86, 100.
  37. ↑ Jonker, Junginger & Faaij 2013, pp. 371–387.
  38. ↑ Madsen & Bentsen 2018, p. 1.
  39. ↑ Bentsen 2017, p. 1211.
  40. ↑ JRC 2014, p. 75.
  41. ↑ Camia et al. 2021, p. 93. Mubareka, Giuntoli & Grassi 2021, pp. 8–9.
  42. ↑ Hektor, Backéus & Andersson 2016, p. 4. See also OECD/IEA 2004, p. 20.
  43. ↑ JRC 2014, p. 75.
  44. ↑ Camia et al. 2021, p. 143. See also JRC 2014, pp. 16–17, 43–44.
  45. ↑ Lamers & Junginger 2013, p. 379.
  46. ↑ JRC 2014, p. 17.
  47. ↑ JRC 2014, p. 34. Note that the JRC use the term "payback time" in the sense of "parity time" as defined in Carbon accounting principles above. See JRC 2014, p. 16.
  48. ↑ IRENA 2014, p. 47.
  49. ↑ European Parliament, Council of the European Union 2018, p. Annex VI.
  50. ↑ "Any soil disturbance, such as ploughing and cultivation, is likely to result in short-term respiration losses of soil organic carbon, decomposed by stimulated soil microbe populations (Cheng, 2009; Kuzyakov, 2010). Annual disturbance under arable cropping repeats this year after year resulting in reduced SOC levels. Perennial agricultural systems, such as grassland, have time to replace their infrequent disturbance losses which can result in higher steady-state soil carbon contents (Gelfand et al., 2011; Zenone et al., 2013)." McCalmont et al. 2017, p. 493.
  51. ↑ Stephenson et al. 2014, p. 3.
  52. ↑ IEA 2021b, p. 94.


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