Global greenhouse gases in the atmosphere have reached an ominous milestone that is unprecedented in human history. The world's longest measure of carbon dioxide in the atmosphere has reached 400 parts per million for the first time in three million years.
The daily CO2 level is measured at the Mauna Loa Observatory in Hawaii, which tracks greenhouse gases in the Northern Hemisphere. The level has been measured at Mauna Loa since 1958, with data before that taken from ice core samples.
The last time it reached this level, temperatures rose by between three and four degrees and sea levels were between five and 40 metres higher than today. Still sceptical? :: Read the full article »»»»