CO2 Levels Pass 3-Million-Year Record
German scientists have confirmed, once again, that carbon dioxide is reaching concentrations unprecedented on any human time scale, with CO2 levels in the atmosphere already higher than they have been for at least three million years.
And their computer simulations – backed up by analysis of ocean sediments that tell a tale of changing temperatures and greenhouse gas levels – show that before the century’s close the world will become warmer than at any time in the last three million years.
The last time planetary temperatures reached a level higher than the target set by 195 nations in Paris in 2015 was during a bygone geological period, the Pliocene.
“It seems we are now pushing our home planet beyond any climatic conditions experienced during the entire current geological period, the Quaternary,” said Matteo Willeit of the Potsdam Institute for Climate Impact Research.
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