By Tim Radford
American researchers say seasonal swings in temperatures and CO2 levels are evidence of how agricultural advances and the population explosion have tilted nature’s balance.
LONDON, 22 November, 2014 – Humans are changing not just climate overall, but also the difference between seasons in any given year.
Researchers in the US 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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