I also think the potential enormous magnitude of the consequences of doing nothing demand erring on the side of protection, not taking a passive wait-and-see attitude.
As an aside, I've been curious about the accuracy of previous predictions that climatologists have made and found a conference report from the 1970's where several groups predicted the amount of carbon dioxide in the atmosphere by about 2010. It was off and on the high side, but not by a large amount. I saw nothing like irresponsible alarmism at work.
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