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CO2 Concentrations Hit Highest Levels in 3 Million Years
Climate Change: Why 415 Is Such a Dangerous Number
By Jeff Goodell
Carbon dioxide hits a level not seen for 3 million years. Here's what that means for climate change — and humanity.
By Denise Chow
CO2 in the atmosphere just exceeded 415 parts per million for the first time in human history
By Jonathan Shieber
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The Concentration of Carbon Dioxide in the Earth's Atmosphere Has Just Hit Levels Unseen in 3 Million Years
By Ciara Nugent
'We Don't Know a Planet Like This': CO2 Levels Hit 415 PPM for First Time in 3 Million+ Years
By Jon Queally
415.26 parts per million: CO2 levels hit historic high
By Patrick Galey
There is more CO2 in the atmosphere today than any point since the evolution of humans
By James Griffiths
Climate change: CO2 levels hit 415 parts per million in human first
By Doyle Rice & Ryan W. Miller