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Geoengineering: Implicit promises

A geoengineering experiment has come unstuck. But there will be more

Source:  Copyright 2012, Economist
Date:  May 20, 2012
Original URL: Status ONLINE

FOR the past few years, a European collaboration called IMPLICC (Implications and Risks of Novel Options to Limit Climate Change) has been looking at what it might mean to engineer the climate, by reducing the amount of sunshine that reaches the Earth’s surface. A lot of IMPLICC’s work, like much else in climate science, has taken the form of computer modelling. In its case the models try to mimic the effects of things like putting veils of reflective particles into the stratosphere, or brightening the clouds over the oceans.

This week the IMPLICC team and other interested parties met in Mainz, Germany, to discuss the results--for the various models have turned out to agree far better than many of their creators expected. In particular, they suggest that particles in the stratosphere can indeed stop rising levels of greenhouse gases raising the overall global temperature, though in doing so they slightly cool the tropics while the poles warm a bit. Other things being ...

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