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George Washington Carver was an American agricultural scientist and inventor who promoted alternative crops to cotton and methods to prevent soil depletion. He was one of the most prominent black scientists of the early 20th century.
Agronomy is the science and technology of producing and using plants by agriculture for food, fuel, fiber, chemicals, recreation, or land conservation. Agronomy has come to include research of plant genetics, plant physiology, meteorology, and soil science. It is the application of a combination of sciences such as biology, chemistry, economics, ecology, earth science, and genetics. Professionals of agronomy are termed agronomists.
Aldo Leopold was an American writer, philosopher, naturalist, scientist, ecologist, forester, conservationist, and environmentalist. He was a professor at the University of Wisconsin and is best known for his book A Sand County Almanac (1949), which has been translated into fourteen languages and has sold more than two million copies.
Urban agriculture refers to various practices of cultivating, processing, and distributing food in urban areas. The term also applies to the area activities of animal husbandry, aquaculture, beekeeping, and horticulture in an urban context. Urban agriculture is distinguished from peri-urban agriculture, which takes place in rural areas at the edge of suburbs.
Ethanol fuel is fuel containing ethyl alcohol, the same type of alcohol as found in alcoholic beverages. It is most often used as a motor fuel, mainly as a biofuel additive for gasoline.
Panicum virgatum, commonly known as switchgrass, is a perennial warm season bunchgrass native to North America, where it occurs naturally from 55°N latitude in Canada southwards into the United States and Mexico. Switchgrass is one of the dominant species of the central North American tallgrass prairie and can be found in remnant prairies, in native grass pastures, and naturalized along roadsides. It is used primarily for soil conservation, forage production, game cover, as an ornamental grass, in phytoremediation projects, fiber, electricity, heat production, for biosequestration of atmospheric carbon dioxide, and more recently as a biomass crop for ethanol and butanol.
Cellulosic ethanol is ethanol produced from cellulose rather than from the plant's seeds or fruit. It can be produced from grasses, wood, algae, or other plants. It is generally discussed for use as a biofuel. The carbon dioxide that plants absorb as they grow offsets some of the carbon dioxide emitted when ethanol made from them is burned, so cellulosic ethanol fuel has the potential to have a lower carbon footprint than fossil fuels.
Corn stover consists of the leaves, stalks, and cobs of maize (corn) plants left in a field after harvest. Such stover makes up about half of the yield of a corn crop and is similar to straw from other cereal grasses; in Britain it is sometimes called corn straw. Corn stover is a very common agricultural product in areas of large amounts of corn production. As well as the non-grain part of harvested corn, the stover can also contain other weeds and grasses. Field corn and sweet corn, two different types of maize, have relatively similar corn stover.
The Soil Science Society of America (SSSA), is the largest soil-specific society in the United States. It was formed in 1936 from the merger of the Soils Section of the American Society of Agronomy and the American Soil Survey Association. The Soils Section of ASA became the official Americas section of the International Union of Soil Sciences in 1934, a notable role which SSSA continues to fulfill.
In order to create ethanol, all biomass needs to go through some of these steps: it needs to be grown, collected, dried, fermented, and burned. All of these steps require resources and an infrastructure. The ratio of the energy released by burning the resulting ethanol fuel to the energy used in the process, is known as the ethanol fuel energy balance and studied as part of the wider field of energy economics. Figures compiled in a 2007 National Geographic Magazine article point to modest results for corn (maize) ethanol produced in the US: 1 unit of energy input equals 1.3 energy units of corn ethanol energy. The energy balance for sugarcane ethanol produced in Brazil is much more favorable, 1 to 8. Over the years, however, many reports have been produced with contradicting energy balance estimates. A 2006 University of California Berkeley study, after analyzing six separate studies, concluded that producing ethanol from corn uses marginally less petroleum than producing gasoline.
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.
The United States produces mainly biodiesel and ethanol fuel, which uses corn as the main feedstock. The US is the world's largest producer of ethanol, having produced nearly 16 billion gallons in 2017 alone. The United States, together with Brazil accounted for 85 percent of all ethanol production, with total world production of 27.05 billion gallons. Biodiesel is commercially available in most oilseed-producing states. As of 2005, it was somewhat more expensive than fossil diesel, though it is still commonly produced in relatively small quantities.
Food versus fuel is the dilemma regarding the risk of diverting farmland or crops for biofuels production to the detriment of the food supply. The biofuel and food price debate involves wide-ranging views, and is a long-standing, controversial one in the literature. There is disagreement about the significance of the issue, what is causing it, and what can or should be done to remedy the situation. This complexity and uncertainty is due to the large number of impacts and feedback loops that can positively or negatively affect the price system. Moreover, the relative strengths of these positive and negative impacts vary in the short and long terms, and involve delayed effects. The academic side of the debate is also blurred by the use of different economic models and competing forms of statistical analysis.
World food prices increased dramatically in 2007 and the first and second quarter of 2008, creating a global crisis and causing political and economic instability and social unrest in both poor and developed nations. Although the media spotlight focused on the riots that ensued in the face of high prices, the ongoing crisis of food insecurity had been years in the making. Systemic causes for the worldwide increases in food prices continue to be the subject of debate. After peaking in the second quarter of 2008, prices fell dramatically during the late-2000s recession but increased during late 2009 and 2010, reaching new heights in 2011 and 2012 at a level slightly higher than the level reached in 2008. Over the next years, prices fell, reaching a low in March 2016 with the deflated Food and Agriculture Organization (FAO) food price index close to pre-crisis level of 2006.
Sustainable biofuel is biofuel produced in a sustainable manner. It is not based on petroleum or other fossil fuels. It includes not using plants that are used for food stuff to produce the fuel thus disrupting the world's food supply.
There are various social, economic, environmental and technical issues with biofuel production and use, which have been discussed in the popular media and scientific journals. These include: the effect of moderating oil prices, the "food vs fuel" debate, poverty reduction potential, carbon emissions levels, sustainable biofuel production, deforestation and soil erosion, loss of biodiversity, effect on water resources, the possible modifications necessary to run the engine on biofuel, as well as energy balance and efficiency. The International Resource Panel, which provides independent scientific assessments and expert advice on a variety of resource-related themes, assessed the issues relating to biofuel use in its first report Towards sustainable production and use of resources: Assessing Biofuels. In it, it outlined the wider and interrelated factors that need to be considered when deciding on the relative merits of pursuing one biofuel over another. It concluded that not all biofuels perform equally in terms of their effect on climate, energy security and ecosystems, and suggested that environmental and social effects need to be assessed throughout the entire life-cycle.
The Institute for Agriculture and Trade Policy (IATP) is an international non-profit research and advocacy organization that promotes sustainable food, farm, and trade systems. IATP has offices in Minneapolis, Minnesota, Washington, D.C., Geneva, Switzerland and Berlin, Germany.
Johannes "Hans" van Leeuwen is educator, engineer, inventor, researcher, and entrepreneur. He is an emeritus professor of Civil, Construction and Environmental Engineering at Iowa State University and an entrepreneur in ethanol co-product development. His research and innovations have worked to solve various problems including, new water purification methods, a way of creating food and animal feed from waste, and a process in making the purest alcohol ever made.
Gerald Arey Miller is an American agronomist, professor, and associate dean emeritus at Iowa State University, former director of its Agriculture and Natural Resources Extension, and former Project Director for the Heartland Regional Water Coordination Initiative in Iowa. He held the rank of Major General in the United States Army.
Paul Wesley Johnson was an American writer, policymaker, and environmentalist.
References
- 1 2 "Dennis Keeney". Institute for Agriculture and Trade Policy. n.d. Retrieved 3 March 2015.
- ↑ Kate Fried (February 20, 2015). "Food for Thought With Dr. Dennis Keeney" (Blog). Washington DC: Food & Water Watch. Retrieved 2 March 2015.
- 1 2 3 Anthony Capps (February 6, 2015). "- Memoir looks at life of first director of the Leopold Center". Ames Tribune. Archived from the original on 23 February 2015. Retrieved 2 March 2015.
- 1 2 Dennis Keeney (30 April 2014). "Dennis Keeney: The other side of corn-based ethanol". Ames Tribune. Archived from the original on 2 April 2015. Retrieved 3 March 2015.
- ↑ "1987-2012". Leopold Center for Sustainable Agriculture. 2012. Retrieved 3 March 2015.[ permanent dead link ]
- ↑ Dennis Keeney and Mark Muller Water Use by Ethanol Plants: Potential Challenges October 24, 2006, IATP.
- ↑ Keeney D Ethanol USA. Environmental Science & Technology. 2009 Jan 1;43(1):8-11. PMID 19209577
- ↑ Levins Publishing (n.d.). "The Keeney Place: A Life in the Heartland". Levins Publishing. Archived from the original on 2 April 2015. Retrieved 2 March 2015.
- ↑ College of Agriculture and Life Sciences (n.d.). "Dennis Keeney Distinguished Lecture Series". Iowa State University. Retrieved 2 March 2015.
