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Published: Friday 27 September, 2013

bags outlet online bags outlet online Ethanol may add to global warming



By H. The study challenges the rush to biofuels as a response to global warming.



The researchers said that past studies showing the benefits of ethanol in combating climate change have not taken into account almost certain changes in land use worldwide if ethanol from corn and in the future from other feedstocks such as switchgrass become a prized commodity.



Using good cropland to expand biofuels will probably exacerbate g bags outlet online lobal warming, concludes the study published in Science magazine.



The researchers said that farmers under economic pressure to produce biofuels will increasingly plow up more forest or grasslands, releasing much of the carbon formerly stored in plants and soils through decomposition or fires. farmers convert land to biofuels, the study said.



The Renewable Fuels Association, which represents ethanol producers, called the researchers view of landuse changes simplistic and said the study fails to put the issue in context.



Assigning the blame for rainforest deforestation and grassland conversion to agri bags outlet online culture solely on the renewable fuels industry ignores key factors that play a greater role, said Bob Dinneen, the associations president.



There has been a rush to developing biofuels, especially ethanol from corn and cellulosic feedstock such as switchgrass and wood chips, as a substitute for gasoline. President Bush signed energy legislation in December that mandates a sixfold increase in ethanol use as a fuel to 36 billion gallons a year by 2022, calling the requirement key to weaning the nation from imported oil.



The new green fuel, whether made from corn or other feedstocks, has been widely promoted both in Congress and by the White House as a key to combating global warming. Burning it produces less carbon dioxide, the leading greenhouse gas, than the fossil fuels it will replace.



During the recent congressional debate over energy legislation, lawmakers frequently cited estimates that cornbased ethanol produces 20 percent less greenhouse gases in production, transportation and use than gasoline, and that cellulosic ethanol has an even greater benefit of 70 percent less emissions.



The study released Thursday by researchers affiliated with Princeton University and a number of other institutions maintains that these analyses were onesided and counted the carbon benefits of using land for bio bags outlet online fuels but not the carbon costs of diverting land from its existing uses.



The study said that after taking into account expected worldwide landuse changes, cornbased ethanol, instead of reducing greenhouse gases by 20 percent, will increases it by 93 percent compared to using gasoline over a 30year period. Biofuels from switchgrass, if they replace croplands and other carbonabsorbing lands, would result in 50 percent more greenhouse gas emissions, the researchers concluded.



Not all ethanol would be affected by the landuse changes, the study said.



We should be focusing on our use of biofuels from waste products such as garbage, which would not result in changes in agricultural land use, Searchinger said in an interview. And you have to be careful how much you require. Use the right biofuels, but dont require too much too fast. It was supported in part indirectly by a grants from NASAs Terrestrial Ecology Program, and by the William and Flora Hewlett Foundation. Searchinger, in addition to his affiliation with Princeton, is a fellow at the Washingtonbased German Marshall Fund of the United States.



The study prompted a letter Thursday to President Bush and Democratic and Republican leaders in Congress from nearly a dozen scientists who urged them to pursue a policy that ensures biofuels are not produced on productive forests, grassland or cropland.



Some opportunities remain to produce environmentally beneficial biofuels while unsound biofuel policies could sacrifice tens of hundreds of million of acres of grasslands and forests while increasing global warming, said the scientists, including four members of the National Academy of Sciences. bags outlet online

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