The amount of heat-trapping carbon dioxide in the atmosphere has shot past a key milestone -- more than 50 per cent higher than pre-industrial times -- and is at levels not seen since millions of years ago when Earth was a hothouse ocean-inundated planet, federal scientists announced Friday.
Carbon dioxide tops 415 ppm, highest level in human history - The Weather Network
What was the highest levels of atmospheric CO2 in the history of Earth? How about in the last 500,000,000 years? - Quora
Human history has never seen carbon dioxide levels this high
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Carbon Dioxide Through Time EARTH 103: Earth in the Future
Go Green Save Earth Foundation
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Today is the Highest Concentration of Atmospheric CO2 in Human History. 415 Parts Per Million. Last Time it Was This High, There Were Trees at the South Pole - Universe Today
Carbon dioxide levels highest in human history
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The Keeling Curve
