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This is Scientific American 60-Second Earth. I'm David Biello. Your minute begins now.

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On March 12, researchers reported that carbon dioxide concentrations in the atmosphere moved above 400 parts-per-million en route to a springtime peak.

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During spring, trees and other plants begin to draw down CO2 levels to fuel leaf growth.

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But this is the second time in as many years that levels have risen above 400 ppm,

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a mark never before experienced in the entire time our species has walked the Earth.

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So the important question is: exactly how sensitive is the Earth's climate to these ever-increasing greenhouse gases?

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Will warming happen gradually or quickly, and to what extent?

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Even more importantly, how can we find out without the potentially catastrophic experiment we are presently running?

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A recent study suggests that other greenhouse gases may be the key to answering this question.

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Specifically soot-like air pollution and ozone.

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Taking into account the unique characteristics of this localized air pollution suggests that the climate is "very unlikely" to be insensitive.

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The research appears in the journal Nature Climate Change.

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That means climate change with an increase of more than a degree Celsius compared with the last century is very likely already.

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It's going to take cutting out most further greenhouse gas pollution to restrain further global warming.

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Your minute is up, for Scientific American 60-Second Earth. I'm David Biello.

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