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Carbon dioxide levels pass 'symbolic mark'

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Carbon dioxide levels pass 'symbolic mark'

A
Al Jazeera English

38 Views • May 11, 2013

Description

Carbon dioxide levels in the atmosphere have broken through what scientists call a symbolic mark. A remote US laboratory has measured CO2 levels at 400 parts per million. Al Jazeera's Tarek Bazley explains what that could mean for earth's climate.