Climate Change Threatens Food Crisis as Croplands Reduced, Says Report

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Global Warming Threatens Croplands: Report

The levels were chosen for the study because they represented "future predicted levels of CO2," according to Ryan Crim, a graduate student who participated in the research and now teaches at Northwest Indian College in Bellingham, Wash. The current models predict levels will reach between 590-1,000 parts per million by the end of the century.

"Eighteen hundred parts per million is ecologically relevant in the sense that the atmosphere is expected to reach that level, but not for another several hundred years," said Crim. "It is likely that levels as high as 1,800 parts per million CO2 can occur during isolated, short-term events."

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