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Soot warming 'maybe bigger than greenhouse gases' - NASA

Forget Copenhagen CO2 cuts, tune your diesel properly

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But according to NASA this week:

The new research, by NASA’s William Lau and collaborators, reinforces with detailed numerical analysis what earlier studies suggest: that soot and dust contribute as much (or more) to atmospheric warming in the Himalayas as greenhouse gases.

"We need to add another topic to the climate dialogue," says Lau.

Hal Maring of NASA headquarters goes further, though he cautions that more field results from the "roof of the world" are necessary to validate Lau's modelling.

"Even at this stage we should be compelled to take notice," says Maring. “Airborne particles have a much shorter atmospheric lifespan than greenhouse gases, so reducing particle emissions can have much more rapid impact on warming.”

One of the most troublesome types of aerosol is "black carbon", dark particulate soot emitted when fuel is incompletely burned. Diesel engines are a particular villain here, but coal burning and primitive cooking are also big contributors. If the new research is right, huge reductions in warming are on offer from comparatively easy initiatives such as better stoves, more efficient modernised diesel engines and cleaner coal powerplants, boilers etc. These measures would also take effect much more quickly than comparatively difficult, expensive and unpopular cuts in emissions of greenhouse gases like CO2 or methane.

Even Lau's Goddard colleague Dr James Hansen, who has spent the last several decades relentlessly bigging-up the greenhouse gas threat and pushing for emissions cuts, now admits that soot is a major issue - though he can't bear to suggest it might actually be bigger than greenhouse gases.

"Black soot is probably responsible for as much as half of the glacial melt," he says.

It seems that the assembled, warring delegates at the Copenhagen greenhouse-gas talks - trying to prevent global temperature rises in the next few decades, ie in the fairly short term - may be arguing over the wrong things. According to the latest NASA research the human race might achieve more by sorting out its soot emissions first, a thing which would be comparatively easy to do, and get to the much more difficult, unpopular and less effective greenhouse gas cuts afterwards. ®

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