Entries by Dr. Peter Gleick

Peter Gleick: An Inevitable Headline in 2014 — ‘Planet’s CO2 Level Reaches 400 ppm for First Time in Human Existence’

Sometime, about one year from now, the front pages of whatever decent newspapers are left will carry a headline like the one above, announcing that for the first time in human existence (or in nearly a million years, or 3 million years, or 15 million years), the global atmospheric concentration of carbon dioxide — the principal gas causing climate change — will have passed 400 parts per million.