Land-Use Analysis of Croplands for Sustainable Food and Energy Production in the United States.

摘要

Energy security and environmental sustainability are major concerns to many in the U.S. Energy from biomass has been proposed as a strategy to help meet future energy needs; however, widespread cultivation for biofuels could have significant impacts on food security and the environment. One solution to minimizing the impacts of biofuel cultivation is to limit production to abandoned croplands where competition from food crops and environmental degradation will be minimized. Here I estimate the spatial distribution of historical U.S. cropland areas from 1850 to 2000 and subsequently calculate abandoned cropland areas for the year 2000. From this data I estimate the potential biomass energy that could be obtained from abandoned croplands. I also estimate the potential for biomass energy to contribute to a renewable energy system consisting of wind and solar power by meeting seasonal energy storage needs that are a result of the intermittent nature of renewable energy sources. Lastly, I use the historical cropland areas result to estimate the ability of U.S. croplands to supply food to local populations at the county level.