Harvard Scientist Proposes Refreezing Arctic to Prevent Global-Warming Disaster

Harvard University geoengineer and environmental scientist David Keith has a "plan B" in case of an environmental emergency.

Keith's unusual proposal is this: Force reflective particles into the Earth's upper atmosphere -- the stratosphere -- to reverse global warming.

"One approach is to disperse particulates at high altitude to reduce the effective solar ?ux entering the atmosphere," Keith and his fellow researchers report in the Nature Climate Change journal and Environmental Research Letters.

The idea comes from nature, Keith said in a TED talk. In 1991, Mount Pinatubo in the Philippines erupted and cooled the Earth. About 15 millions tons of sulfur dioxide rose into the upp…
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