I think the real issue is how much money we're willing to spend to make no measurable difference in world climate, particularly with China and India not playing along. Hell, Europe recently bailed on its own targets due to cost (and lack of results).
Bottom line - If we want to "save the world," there are a lot cheaper and more effective ways of doing so (vaccinations and AIDS treatment in the third world, potable water ...)
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As long as the roots are not severed, all will be well in the garden.
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