09/09/2012 01:27 pm ET

‘Blue Carbon’ Adding To Carbon Emission Blues

Climate scientists know with impressive accuracy how fast carbon dioxide is increasing in the atmosphere. A decade ago, there were about 370 parts per million of the heat-trapping gas floating around; today, the number is up to 393 or so. Much of that increase comes from the burning of fossil fuels like coal, gas and oil -- but not all, and putting numbers on other sources is crucial to figuring out how to keep carbon emissions under control.

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