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We've reached a troubling carbon dioxide milestone

2013-05-29 13:16:00| Climate Ark Climate Change & Global Warming Newsfeed

New Scientist: Atmospheric scientist Ralph Keeling explains the importance of measuring a CO2 concentration of 400 parts per million at the observatory his father set up The Mauna Loa Observatory in Hawaii has reportedly recorded a carbon dioxide concentration there of 400 parts per million for the first time. How significant is that? It's a psychological milestone. Every year in the last few decades, CO2 concentrations have been going up by about 2 ppm per year. Those changes go unnoticed but people pay...

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