Sentences with phrase «recommended safe threshold»
Three hundred fifty parts per million (350 ppm) is the recommended safe threshold for carbon dioxide in our atmosphere.
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Last year, James Hansen of GISS and Columbia University said that we may have already exceeded the maximum safe threshold for CO2 in atmosphere — we're presently at approximately 387 parts - per - million (ppm) and Hansen said that we needed to target 350 ppm as the stabilization threshold, not 450 - 500 as recommended in the last IPCC assessment report.