Low-carbon diet

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Vegetables are low-carbon compared to meats. Bowls of African Food Ingredients.jpg
Vegetables are low-carbon compared to meats.

A low-carbon diet is any diet that results in lower greenhouse gas emissions. [1] [2] Choosing a low carbon diet is one facet of developing sustainable diets which increase the long-term sustainability of humanity. Major tenets of a low-carbon diet include eating a plant-based diet, and in particular little or no beef and dairy. [3] Low-carbon diets differ around the world in taste, style, and the frequency they are eaten. Asian countries like India and China feature vegetarian and vegan meals as staples in their diets. In contrast, Europe and North America rely on animal products for their Western diets. [4]

Contents

It is estimated that the food system is responsible for a quarter to a third of human-caused greenhouse gas emissions. [5] More fossil fuels are required for the production of animal-based foods like meat and dairy and have a higher carbon footprint. [6] Large amounts of land are required to raise livestock for beef and dairy products and methane emissions from cattle contribute to the greenhouse gases in the atmosphere. However, carbon emissions from transportation and packaging for plant-based diets are similar in scale to animal-based diets. [7] Local production can be much more energy intensive and inefficient compared to industrialized production. [8]

Meal with vegetarian sausages at a pub in London, UK Exmouth Arms, Somers Town, London (4092315906).jpg
Meal with vegetarian sausages at a pub in London, UK

A 2014 study into the real-life diets of British people estimated their greenhouse gas footprints in terms of kilograms of carbon dioxide equivalent per day: [9]

Vegan tacos from Mexico Tacos veganos surtidos 03.jpg
Vegan tacos from Mexico

While the fish-eaters had the lowest footprints out of all the meat-eaters, the vegetarians and vegans were the lowest overall. This is due to the contribution of greenhouse gases in the growth, processing, production, and transport of the plant-based food products eaten by vegetarians and vegans. [9]

A 2020 study found that Asia has the largest percentage of vegetarians at 19%. Close behind Asia is Africa/the Middle East with 16%. South and Central America have just 8% and North America has a mere 6%. This study found that Europe has the smallest percentage of vegetarians at only 5%. [4] There was not conclusive data on the percentage of vegetarians in Australia.

Vegetarian thali (plate) from India Vegetarian Thali.jpg
Vegetarian thali (plate) from India

Non-Western diets are built around unprocessed starches. In South America and Africa, the centerpiece of each meal is beans and grains. Peru, in South America, has potatoes as the foundation for their diet. In Asia, rice is a staple in every household no matter the income level. Meat is usually the centerpiece of meals in the Western diet, whereas animal products are often small parts of the meal (or act as condiments) in the non-Western diet. [10]

In India, the practice of the vegetarian diet is usually generational and simply follows the pattern expected of the family. Adherence can also be credited to certain religious groups and social groups. For example, Hindus do not eat beef because they believe that red meat from cattle is impure. Some of the vegetarian staples consumed are a mixture of whole grains along with nuts/seeds and legumes. Dairy is also included in the Indian vegetarian diet, with unique spices and seasonings per region. However, certain populations in India have begun eating meat due to the growing popularity of western diets. [11]

Classic vegetarian dish from China A Five selections of Chinese Vegetarian Platter in Hong Kong.jpg
Classic vegetarian dish from China

Asia includes largely populated countries such as China and India, both of which have thriving Buddhist populations. In China, there are five main influences that contribute to Buddhists keeping vegetarian diets: [12]

  1. Influence from Mahayana sutras
  2. Influence of Chinese imperial authority/political figures who promote Buddhism
  3. Influence of Confucianism
  4. Influence of Taoism
  5. Sociocultural influences like societal norms and lived environments

Background on diet and greenhouse gas emissions

Global greenhouse gas emissions from food production. Global greenhouse gas emissions from food production.png
Global greenhouse gas emissions from food production.

In the U.S., the food system emits four of the greenhouse gases associated with climate change: carbon dioxide (CO2), methane, nitrous oxide and chlorofluorocarbons. [13] The burning of fossil fuels (such as oil and gasoline) to power vehicles that transport food for long distances by air, ship, truck and rail releases carbon dioxide, the primary gas responsible for global warming. Chlorofluorocarbons (CFCs) are emitted from mechanical refrigerating and freezing mechanisms – both staples in food shipment and storage. [14] Anthropogenic methane emission sources include agriculture (ruminants, manure management, wetland rice production), various other industries and landfills. Anthropogenic nitrous oxide sources include fertilizer, manure, crop residues and nitrogen-fixing crops production. [15] Methane and nitrous oxide are also emitted in large amounts from natural sources. The 100-year global warming potentials of methane and nitrous oxide are recently estimated at 25 and 298 carbon dioxide equivalents, respectively. [16]

Steinfeld et al. estimate that livestock production accounts for 18 percent of anthropogenic GHG emissions expressed as carbon dioxide equivalents. [17] Of this amount, 34 percent is carbon dioxide emission from deforestation, principally in Central and South America, that they assigned to livestock production. However, deforestation associated with livestock production is not an issue in many regions. In the US, the land area occupied by forest increased between 1990 and 2009 [18] and a net increase in forest land area was also reported in Canada. [19]

Of emissions they attribute to livestock production, Steinfeld et al. estimate that globally, methane accounts for 30.2 percent. Like other greenhouse gases, methane contributes to global warming when its atmospheric concentration rises. Although methane emission from agriculture and other anthropogenic sources has contributed substantially to past warming, it is of much less significance for current and recent warming. This is because there has been relatively little increase in atmospheric methane concentration in recent years [20] [21] [22] [23] The anomalous increase in methane concentration in 2007, discussed by Rigby et al., has since been attributed principally to anomalous methane flux from natural wetlands, mostly in the tropics, rather than to anthropogenic sources. [24]

Livestock sources (including enteric fermentation and manure) account for about 3.1 percent of US anthropogenic GHG emissions expressed as carbon dioxide equivalents. [15] This EPA estimate is based on methodologies agreed to by the Conference of Parties of the UNFCCC, with 100-year global warming potentials from the IPCC Second Assessment Report used in estimating GHG emissions as carbon dioxide equivalents.

A 2016 study published in Nature Climate Change concludes that climate taxes on meat and milk would simultaneously produce substantial cuts in greenhouse gas emissions and lead to healthier diets. Such taxes would need to be designed with care: exempting and subsidising some food groups, selectively compensating for income loss, and using part of the revenue for health promotion. The study analyzed surcharges of 40% on beef and 20% on milk and their effects on consumption, climate emissions, and distribution. An optimum plan would reduce emissions by 1 billion tonnes per year – similar in amount to those from aviation globally. [25] [26]

High-carbon and low-carbon food choices

Greenhouse impact across food categories: results from a 2017 review of 389 life-cycle assessments Clune2016 food lca.svg
Greenhouse impact across food categories: results from a 2017 review of 389 life-cycle assessments

Certain foods require more fossil fuel inputs than others. Animal-based foods like meat and dairy have a much higher carbon footprint than plant-based foods. [6] Therefore, it is possible to go on a low-carbon diet and reduce one’s carbon footprint by choosing foods that need less fossil fuel and therefore emit less carbon dioxide and other greenhouse gases. Further research finds that even "the lowest-impact animal products typically exceed those of vegetable substitutes". [28] For example, Ritchie explains that "producing 100 grams of protein from peas emits just 0.4 kilograms of carbon dioxide equivalents (CO2eq). To get the same amount of protein from beef, emissions would be nearly 90 times higher, at 35 kgCO2eq." [6]

In June 2010, a report from United Nations Environment Programme declared that a global shift towards a vegan diet was needed to save the world from hunger, fuel shortages and climate change. [29] This will mean a huge shift in the diet of the average European, as 83% of their diets are made up of meat, dairy, and eggs. [30] As a major contributor to global carbon emissions, China introduced new dietary guidelines in 2016 which aim to cut meat consumption by 50% and thereby reduce greenhouse gas emissions by 1 billion tonnes by 2030. [31]

More families are choosing to implement vegan and vegetarian diets for adults and children alike. Cundiff and Harris write: "The American Dietetic Association (ADA) and Dietitians of Canada position paper officially recognizes that well-planned vegan and other vegetarian diets are appropriate for infancy and childhood." [32] [33] However, European recommendations for children's diets do not include the vegan diet. They stand that there should be necessary "medical and dietetic supervision" in order for the safety of the vegan child to be kept in mind. It has been noted that "the more restrictive the diet and the younger the child, the greater the risk of nutritional deficiency." [34] The most common nutrients left out of the vegan child's diet are as follows:

Industrial versus pastured livestock

Insect food snack product. Insects could be an alternative protein source with a lower carbon footprint compared to animal-based protein. Entis BugBites oat snacks with cultivated cricket flour.jpg
Insect food snack product. Insects could be an alternative protein source with a lower carbon footprint compared to animal-based protein.

Beef and dairy cattle have extremely high levels of greenhouse gas emissions, due to methane emissions from enteric fermentation, and their very large land footprint. Feed is a significant contributor to emissions from animals raised in Confined Animal Feeding Operations (CAFOs) or factory farms, as corn or soybeans must be fertilized, irrigated, processed into animal feed, packaged and then transported to the CAFO. In 2005, CAFOs accounted for 74% of the world's poultry production, 50% of pork, 43% of beef, and 68% of eggs, according to the Worldwatch Institute. Proportions are significantly higher in developed countries, but are growing rapidly in developing countries, where demand is also growing fast. [36] However, in the US, only about 11% of soybean acres and 14% of corn acres are irrigated; in contrast, about 66% of vegetable acres and 79% of orchard acres are irrigated. [37] [38] Soybean meal for livestock feed is commonly produced after extraction of soybean oil (used for cooking, food products, biodiesel, etc., [39] [40] so that only a fraction of processing is assignable to feed. Such examples illustrate that issues relating to irrigation, fertilization and processing for meat production should also be of concern with regard to production of other foods.

In one study, grass-fed cattle were estimated to account for 40% less greenhouse emissions than CAFO cattle [7] However, comparative effects on emissions can vary. In a US study, lower GHG emissions were associated with feedlot-finished beef production than with beef production on pasture and hay. [41] Similarly, a study in New Zealand concluded that environmental emissions per kilogram of beef produced can be reduced by incorporating feedlot finishing in a beef production system. [42] Another factor to be considered is the role of a healthy pastoral ecosystem in carbon sequestration.

Because CAFO production is highly centralized, the transport of animals to slaughter and then to distant retail outlets is a further source of greenhouse gas emissions.

In livestock production, emissions are reduced by feeding human-inedible materials that might otherwise by wasted. Elferink et al. state that "Currently, 70% of the feedstock used in the Dutch feed industry originates from the food processing industry." [43] Among several US examples is the feeding of distillers grains remaining from biofuel production. For the marketing year 2009/2010, the amount of dried distillers grains used as livestock feed (and residual) in the US amounted to 25.0 million tonnes. [44]

Distance traveled and method of transit

Take a Bite Out Of Climate Change flashcards Climate food flashcards main nov19 v2 onepersheet.pdf
Take a Bite Out Of Climate Change flashcards

Carbon emissions from transport account for 11% of the total carbon emissions of food, of which the transportation from producer to consumer accounts for 4%. [45] However, "food miles" are a misleading measure; in many cases food imported from the other side of the world may have a lower carbon footprint than a locally produced equivalent, due to differences in farming methods. "Local food" campaigns may be motivated by protectionism rather than genuine environmentalism. [46]

When looking at total greenhouse gases (not just carbon dioxide), 83% of emissions come from the actual production of the food because of the methane released by livestock and the nitrous oxide due to fertilizer. [45]

The word locavore describes a person attempting to eat a diet consisting of foods harvested from within a 100-mile radius. Some studies have criticized the emphasis on local food, claiming that it romanticizes local production, but does not produce very much environmental benefit. Transportation accounts for a relatively small portion of overall energy consumption in food production, and locally produced food may be much more energy intensive than food produced in a better area. Additionally the emphasis on "inefficient" local producers over more efficient ones further away may be damaging. [8]

Processing, packaging, and waste

Highly processed foods (such as granola bars, snack chips, dessert treats, etc.) come in individual packaging, demanding high energy inputs and resulting in packaging waste. Although processed foods create much packaging waste, some studies suggest that there are pros: Food packaging is important for maintaining the freshness of food items throughout their transit journeys. Additionally, food packaging ensures the safety of the food products by keeping them clean and sanitary. Lastly, consumers get important information about what ingredients the food was made with by reading the food packaging. [47]

Bottled water is another example of a highly packaged food product that is considered a single-use plastic because most people discard it after they're done drinking the water. It is estimated that Americans throw away 40 million plastic water bottles every day, and bottled water is often shipped trans-continentally. Carbonated water must be chilled and kept under pressure during storage and transport so as to keep the carbon dioxide dissolved. This factor contributes greater energy usage for products shipped longer distances.

A 2023 study by Siddiqui S. A., et al. [48] evaluated the quality of biodegradable packaging versus conventional plastic packaging for the meat packaging industry in the European Union. Conventional plastic packaging is known for being very flexible and able to stretch greatly during processing, shipping, and handling. With easily customizable production and relatively low cost, plastic packaging is picked most often over glass, cardboard, and other sustainable packaging materials. This study researched which types of biodegradable packaging are the most heat-resistant as well, as plastic has tested superior in this aspect in the past. The future of sustainability with low-carbon production for food packaging rides on biodegradable packaging. Cellulose-based packaging was highly effective at controlling moisture within meat packages in the EU and was able to prevent oxygen from entering. Polyhydroxyalkanoates and polylactic acid (PLA) are examples of sustainable food packaging materials that are considered better than plastic, but could actually be harmful because they may contain chemical additives.

See also

Related Research Articles

<span class="mw-page-title-main">Plant-based diet</span> Diet consisting mostly or entirely of plant-based foods

A plant-based diet is a diet consisting mostly or entirely of plant-based foods. Plant-based diets encompass a wide range of dietary patterns that contain low amounts of animal products and high amounts of fiber-rich plant products such as vegetables, fruits, whole grains, legumes, nuts and seeds. They do not need to be vegan or vegetarian, but are defined in terms of low frequency of animal food consumption.

<span class="mw-page-title-main">Meat industry</span> People and companies engaged in industrialized livestock agriculture

The meat industry are the people and companies engaged in modern industrialized livestock agriculture for the production, packing, preservation and marketing of meat. In economics, the meat industry is a fusion of primary (agriculture) and secondary (industry) activity and hard to characterize strictly in terms of either one alone. The greater part of the meat industry is the meat packing industry – the segment that handles the slaughtering, processing, packaging, and distribution of animals such as poultry, cattle, pigs, sheep and other livestock.

<span class="mw-page-title-main">Carbon footprint</span> Concept to quantify greenhouse gas emissions from activities or products

A carbon footprint (or greenhouse gas footprint) is a calculated value or index that makes it possible to compare the total amount of greenhouse gases that an activity, product, company or country adds to the atmosphere. Carbon footprints are usually reported in tonnes of emissions (CO2-equivalent) per unit of comparison. Such units can be for example tonnes CO2-eq per year, per kilogram of protein for consumption, per kilometer travelled, per piece of clothing and so forth. A product's carbon footprint includes the emissions for the entire life cycle. These run from the production along the supply chain to its final consumption and disposal.

<span class="mw-page-title-main">Food miles</span> Distance food is transported from production to consumption

Food miles is the distance food is transported from the time of its making until it reaches the consumer. Food miles are one factor used when testing the environmental impact of food, such as the carbon footprint of the food.

<span class="mw-page-title-main">Ethics of eating meat</span> Food ethics topic

Conversations regarding the ethics of eating meat are focused on whether or not it is moral to eat non-human animals. Ultimately, this is a debate that has been ongoing for millennia, and it remains one of the most prominent topics in food ethics. Individuals who promote meat consumption do so for a number of reasons, such as health, cultural traditions, religious beliefs, and scientific arguments that support the practice. Those who support meat consumption typically argue that making a meat-free diet mandatory would be wrong because it fails to consider the individual nutritional needs of humans at various stages of life, fails to account for biological differences between the sexes, ignores the reality of human evolution, ignores various cultural considerations, or because it would limit the adaptability of the human species.

<span class="mw-page-title-main">Environmental vegetarianism</span> Type of practice of vegetarianism

Environmental vegetarianism is the practice of vegetarianism that is motivated by the desire to create a sustainable diet, which avoids the negative environmental impact of meat production. Livestock as a whole is estimated to be responsible for around 15% of global greenhouse gas emissions. As a result, significant reduction in meat consumption has been advocated by, among others, the Intergovernmental Panel on Climate Change in their 2019 special report and as part of the 2017 World Scientists' Warning to Humanity.

<span class="mw-page-title-main">Greenhouse gas emissions</span> Greenhouse gases emitted from human activities

Greenhouse gas (GHG) emissions from human activities intensify the greenhouse effect. This contributes to climate change. Carbon dioxide, from burning fossil fuels such as coal, oil, and natural gas, is one of the most important factors in causing climate change. The largest emitters are China followed by the United States. The United States has higher emissions per capita. The main producers fueling the emissions globally are large oil and gas companies. Emissions from human activities have increased atmospheric carbon dioxide by about 50% over pre-industrial levels. The growing levels of emissions have varied, but have been consistent among all greenhouse gases. Emissions in the 2010s averaged 56 billion tons a year, higher than any decade before. Total cumulative emissions from 1870 to 2022 were 703 GtC, of which 484±20 GtC from fossil fuels and industry, and 219±60 GtC from land use change. Land-use change, such as deforestation, caused about 31% of cumulative emissions over 1870–2022, coal 32%, oil 24%, and gas 10%.

<span class="mw-page-title-main">Sustainable food system</span> Balanced growth of nutritional substances and their distribution

A sustainable food system is a type of food system that provides healthy food to people and creates sustainable environmental, economic, and social systems that surround food. Sustainable food systems start with the development of sustainable agricultural practices, development of more sustainable food distribution systems, creation of sustainable diets, and reduction of food waste throughout the system. Sustainable food systems have been argued to be central to many or all 17 Sustainable Development Goals.

<i>Livestocks Long Shadow</i> United Nations report

Livestock's Long Shadow: Environmental Issues and Options is a United Nations report, released by the Food and Agriculture Organization (FAO) of the United Nations on 29 November 2006, that "aims to assess the full impact of the livestock sector on environmental problems, along with potential technical and policy approaches to mitigation". It stated that livestock accounts for 18% of anthropogenic greenhouse gas emissions, a figure which FAO changed to 14.5% in its 2013 study Tackling climate change through livestock.

<span class="mw-page-title-main">Environmental impacts of animal agriculture</span> Impact of farming animals on the environment

The environmental impacts of animal agriculture vary because of the wide variety of agricultural practices employed around the world. Despite this, all agricultural practices have been found to have a variety of effects on the environment to some extent. Animal agriculture, in particular meat production, can cause pollution, greenhouse gas emissions, biodiversity loss, disease, and significant consumption of land, food, and water. Meat is obtained through a variety of methods, including organic farming, free-range farming, intensive livestock production, and subsistence agriculture. The livestock sector also includes wool, egg and dairy production, the livestock used for tillage, and fish farming.

The environmental impact of agriculture is the effect that different farming practices have on the ecosystems around them, and how those effects can be traced back to those practices. The environmental impact of agriculture varies widely based on practices employed by farmers and by the scale of practice. Farming communities that try to reduce environmental impacts through modifying their practices will adopt sustainable agriculture practices. The negative impact of agriculture is an old issue that remains a concern even as experts design innovative means to reduce destruction and enhance eco-efficiency. Animal agriculture practices tend to be more environmentally destructive than agricultural practices focused on fruits, vegetables and other biomass. The emissions of ammonia from cattle waste continue to raise concerns over environmental pollution.

<i>Asparagopsis taxiformis</i> Species of seaweed

Asparagopsis taxiformis, formerly A. sanfordiana, is a species of red algae, with cosmopolitan distribution in tropical to warm temperate waters. Researchers have demonstrated that feeding ruminants a diet containing 0.2% A. taxiformis seaweed reduced their methane emissions by nearly 99 percent.

<span class="mw-page-title-main">Pescetarianism</span> Dietary practice of incorporating seafood into an otherwise vegetarian diet

Pescetarianism is a dietary practice in which seafood is the only source of meat in an otherwise vegetarian diet. The inclusion of other animal products, such as eggs and dairy, is optional. According to research conducted from 2017 to 2018, approximately 3% of adults worldwide are pescetarian.

<span class="mw-page-title-main">Individual action on climate change</span> What everyone can do to limit climate change

Individual action on climate change is about personal choices that everyone can make to reduce the greenhouse gas emissions of their lifestyles. Such personal choices are related to the way people travel, their diet, shopping habits, consumption of goods and services, number of children they have and so on. Individuals can also get active in local and political advocacy work around climate action. People who wish to reduce their carbon footprint, can for example reduce their air travel for holidays, use bicycles instead of cars on a daily basis, eat a plant-based diet, and use consumer products for longer. Avoiding meat and dairy products has been called "the single biggest way" how individuals can reduce their environmental impacts.

A meat tax is a tax levied on meat and/or other animal products to help cover the health and environmental costs that result from using animals for food. Livestock is known to significantly contribute to global warming, and to negatively impact global nitrogen cycles and biodiversity.

Gidon Eshel is an American geophysicist best known for his quantification of the "geophysical consequences of agriculture and diet". As of 2017, he is research professor at Bard College in New York. He is known for his research on the environmental impacts of plant-based diets.

<span class="mw-page-title-main">FutureFeed</span>

FutureFeed was established by Australia's Commonwealth Scientific and Industrial Research Organisation (CSIRO) for seaweed as a ruminant livestock feed ingredient that can reduce methane emissions by 80% or more. FutureFeed holds the global intellectual property to use Asparagopsis for livestock feed. Lowered methane emissions can be achieved by the addition of a small amount of the seaweed into the daily diet of livestock. This discovery was made by a team of scientists from CSIRO and James Cook University (JCU), supported by Meat & Livestock Australia (MLA), who came together in 2013 to investigate the methane reduction potential of various native Australian seaweeds.

<span class="mw-page-title-main">Climate-smart agriculture</span> System for agricultural productivity

Climate-smart agriculture (CSA) is a set of farming methods that has three main objectives with regards to climate change. Firstly, they use adaptation methods to respond to the effects of climate change on agriculture. Secondly, they aim to increase agricultural productivity and to ensure food security for a growing world population. Thirdly, they try to reduce greenhouse gas emissions from agriculture as much as possible. Climate-smart agriculture works as an integrated approach to managing land. This approach helps farmers to adapt their agricultural methods to the effects of climate change.

<span class="mw-page-title-main">Greenhouse gas emissions from agriculture</span>

The amount of greenhouse gas emissions from agriculture is significant: The agriculture, forestry and land use sectors contribute between 13% and 21% of global greenhouse gas emissions. Emissions come from direct greenhouse gas emissions. And from indirect emissions. With regards to direct emissions, nitrous oxide and methane makeup over half of total greenhouse gas emissions from agriculture. Indirect emissions on the other hand come from the conversion of non-agricultural land such as forests into agricultural land. Furthermore, there is also fossil fuel consumption for transport and fertilizer production. For example, the manufacture and use of nitrogen fertilizer contributes around 5% of all global greenhouse gas emissions. Livestock farming is a major source of greenhouse gas emissions. At the same time, livestock farming is affected by climate change.

Climatarian diet is a diet focused on reducing the climate footprint.

References

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