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I figure why take a chance if it's natural or man-made when (IMO) limiting the potential causes is a good thing no matter what...though of course the cost issue comes up. I think it's just the cost of living on earth and we have to deal with it. The less we pollute the earth the better. Even a little bit of "trash" is unacceptable, whether it be air, water, soil.
Yesterday I heard a related editorial report about a NASA scientist's proposal from a few years ago saying that we can limit global warming by seeding the atmosphere with certain aerosols...sort of like when a volcano erupts and that causes major global cooling. The scientific consensus seems to be that it is not only possible, but easy and relatively cheap to accomplish. An interesting point was that we might want to experiment with those methods on a small scale in the event we have to resort to such drastic measures to minimize global starvation or sudden rise of ultraviolet radiation from ozone depletion, or other such catastrophic situations. Of course I think that man meddling in complex natural cycles is dangerous and unpredictable so I'm not in favor of doing this on a large scale unless we have no other alternative.
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