Sentences with phrase «land conversions necessary»
These feed crops have to be grown somewhere, however, and the worldwide land conversions necessary to make up for lost U.S. crops would release carbon dioxide.
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As eight millennia of experience and the unfolding disaster of agrofuel clearly demonstrate, expansion of land - conversion by industrial agriculture strongly threatens biodiversity and ecosystems that play an essential role in stabilising and regulating the climate, and are necessary to ensure food and water security.
Searchinger et al. (2008, 2009) examined this issue related to corn ethanol and suggested that substituting corn ethanol for petroleum would increase carbon emissions associated with the land conversion abroad necessary to offset the decline in corn availability.