Has biofuels led to major land use changes in the US?

And is the land that is being converted from grassland to corn and soy the “marginal land” that people take about growing dedicated bioenergy crops?  A new article in PNAS this week seems to answer “yes” to both these questions.

http://www.motherjones.com/tom-philpott/2013/02/king-corn-gobbles-climate-stabilizing-grassland-midwest

Wright, C., & Wimberly, M. (2013). Recent land use change in the Western Corn Belt threatens grasslands and wetlands Proceedings of the National Academy of Sciences DOI: 10.1073/pnas.1215404110

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