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In 1950 there were 5,600m2 of arable land per person, if present trends continue, by 2050, this might be reduced to only 1,500m2, due to population growth...

Source: FAO, Soil degradation

Crops that are grown strictly for energy use, such as switchgrass in the United States, have received much attention as potential renewable sources for bioelectricity; however, markets...