Enormous 'Parasol' Could Stop Global Warming

As scientists search for quicker fixes to the problem of global warming, some have been studying a technique they compare to a parasol.

Ken Caldeir of the Carnegie Institute explains a plan for blocking some of the sun's rays, as well as ideas for harnessing the jet stream as a new source of fuel.

On our blog:
Scientist proposes mechanical tree.
Scientists aim to stash carbon underground.
Scientist says a phytoplankton bloom could save us all.
A round-up of wacky ideas that just might work.

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