Sentences with phrase «atmosphere last hit»

So the foraminifera, unfortunately, can't tell us exactly when the atmosphere last hit 400 ppm of CO2.

Not exact matches

(05/13/2013) Even as concentrations of carbon dioxide in the atmosphere hit 400 parts per million (ppm) for the first time in human history last week, a new study in Nature Climate Change warns that thousands of the world's common species will suffer grave habitat loss under climate change.

Overall, as much as 300 to 400 gigatons of methane could be at risk and even a fraction of this store hitting the atmosphere would cause serious and lasting harm.