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Geo-Engineers Not Quite Ready to Save Earth

Far-flung ideas hold promise, but the science still lags

By Wesley Oliver,  Newser Staff

Posted Jan 30, 2009 4:36 PM CST

(Newser) – Their proposals to combat global warming may sound like science fiction, but geo-engineers insist they can save the planet. Two new reports show that while that may be the case, the science has a long way to go, the Economist reports. The burgeoning field posits that humans can cool the planet via unorthodox ideas such as dumping tons of iron into oceans. In theory, that boosts the growth of algae, which absorb carbon-dioxide emissions.

But one of the first major studies finds that benefits have been greatly overstated. A second casts doubt on several other ideas, including a massive solar shade to shield the earth from the sun: It would have to be half the size of Brazil. Any effective geo-engineering project would need to be massive, thus leading to huge side effects and the disruption of ecosystems—ensuring that the debate over global warming will remain heated.

Another proposal to encourage cloud formation over the oceans by spraying seawater into the air would be roughly as helpful as pumping the stratosphere full of particles.
Another proposal to encourage cloud formation over the oceans by spraying seawater into the air would be roughly as helpful as pumping the stratosphere full of particles.   (Shutter Stock)
Geo-engineering ideas, even if they sound implausible, are a secret comfort to many of those frustrated by the lack of progress around the world in cutting emissions of greenhouse gases.
Geo-engineering ideas, even if they sound implausible, are a secret comfort to many of those frustrated by the lack of progress around the world in cutting emissions of greenhouse gases.   (Shutter Stock)
The researchers say that dumping extra iron into water boosted growth rates of tiny algae and carbon-dioxide consumption between two- and threefold.
The researchers say that dumping extra iron into water boosted growth rates of tiny algae and carbon-dioxide consumption between two- and threefold.   (AP Photo/NOAA, Jean Kenyon)
Injecting sulphate particles into the stratosphere, for instance, would cool the Earth by reflecting more sunlight into space, scientists say.
Injecting sulphate particles into the stratosphere, for instance, would cool the Earth by reflecting more sunlight into space, scientists say.   (Shutter Stock)
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