Nov. 10, 2008 -- Earth needs a "Plan B" in the fight against global warming, in case efforts to curb greenhouse emissions fail or are inadequate, said an American scientist in testimony Monday to the British government.
Such a backup plan would probably need to involve climate engineering projects to deliberately counteract the effects of global warming. The engineering ideas that have been floated in recent years include injecting sunlight-blocking compounds into the upper atmosphere or building a gigantic structure in space to filter sunlight reaching Earth.
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