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By Robert Ferris, Nov 12, 2015 CNBC
Earth's land and ocean currently absorb about half of all carbon dioxide emissions from the burning of fossil fuels and other sources. But the amount of carbon entering the atmosphere may be changing nature in ways that leave scientists uncertain whether the planet can keep absorbing even that amount of carbon in the future.
Since the Industrial Revolution, carbon levels have increased 2.5 times to more than 400 parts per million at present, said Michael Freilich, director of NASA's Earth Science Division, in a call with reporters Thursday. That is higher than it has been in the last 400,000 years.
He added that scientists know, from ice cores and other information, that carbon levels in the atmosphere hovered between 180 and 280 parts per million until about the 1800s.
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