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Climate Change Was First Seen. Now Time Is Running Out

By Richard Wiles Photo by Marcus Yam/LA Times via Getty Images

CO2 levels in the atmosphere stood about 323ppm. The planet was warming but was still well within the historical norm. Sea levels had risen by about 4in compared with 1880 levels. The report, however, cautioned that “man is now engaged in a vast geophysical experiment with his environment, the Earth” and that “significant temperature changes are almost certain to occur by the year 2000.

03/05/18