Green Revolution trebles human burden on planet
24 Nov 2014

By TIM RADFORD.- Humans are changing not just climate overall, but also the difference between seasons in any given year.
Researchers in the United States believe they now know why global warming has begun to announce itself both in annual rises in temperature and in the seasonal records of carbon dioxide in the northern hemisphere − the same seasonal variation in atmospheric chemistry that also contains within it the signature of the Green Revolution and the 20th-century population explosion.
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