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.....Last week, the ratio of carbon dioxide in the atmosphere soared to the highest daily average ever recorded by an air monitor station at Mauna Loa in Hawaii — nearly 400 parts per million (ppm), said John Ewald, a spokesman for the National Oceanic and Atmospheric Association, who called it "an extremely important milestone." When that gauge was installed in 1958, the observatory measured a CO2 concentration of 313 ppm. The number means there were 313 molecules of carbon dioxide in the air for every 1 million molecules of air.......
http://t.nbcnews.com/business/food-supply-under-assault-climate-heats-1C9909477
好好享用今天的食物,数十年后要改观了!
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