Carbon dioxide levels highest in human history

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 levels reach highest recorded levels in human history - CNET

Earth's Carbon Dioxide Levels Are Highest In Human History: Report

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Carbon Dioxide Levels Now Higher Than Ever in Human History, Smart News

Greenhouse Gas concentrations hit record high. Again.

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Climate Change: Atmospheric Carbon Dioxide

Earth's Carbon Dioxide Levels Are Highest In Human History: Report

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Carbon Dioxide Levels Are Highest in Human History - The New York Times