Use of U.S. Croplands for Biofuels Increases Greenhouse Gases Through Emissions from Land-Use Change

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Science  29 Feb 2008:
Vol. 319, Issue 5867, pp. 1238-1240
DOI: 10.1126/science.1151861

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  • Response to M. Wang and Z. Haq's E-Letter

    M. Wang and Z. Haq argue that the results of our study are undercut by the fact that U.S. corn exports have remained this year at around 2 billion bushels a year. However, to maintain these corn exports in 2007, the U.S. planted 16 million more acres to corn in 2007 than it did in 2006, a 22% increase(1). Those acres came mainly out of soybeans, but also some out of cotton. That resulted in decreases in soybean and whe...

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    Competing Interests: None declared.
  • Ethanol's Effects on Greenhouse Gas Emissions

    The article by T. Searchinger et al. (Reports, "Use of U.S. croplands for biofuels increases greenhouse gases through emissions from land-use change," 29 February 2008, p. 1238; Published online 7 February 2008) provides a timely discussion of ethanol's potential effects on greenhouse gas (GHG) emissions when taking into account direct and indirect land-use changes.

    Searchinger et al. used the GREET m...

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    Competing Interests: None declared.
  • Food, Land Use Changes, and Biofuels

    T. Searchinger et al. [as well as Fargione et al. (1)] make the case that whether biofuel production has a net greenhouse gas benefit depends on land use changes as large new areas are converted to agricultural uses and a carbon debt is incurred. Alternatively, dietary changes in the United States could free vast areas for biofuel production without converting more land to agricultural use. Beef requi...

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    Competing Interests: None declared.

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