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It's possible some positive regional effects could come out of it. It's definite a large number of negative effects will. As noted above, even small differences in temperature have a large impact on hurricane formation and peak power. Coastal flooding will increase. Ecosystems will change suddenly (ones to tens of years) enough that significant extinctions are inevitable. The list goes on.
You're correct that we don't understand all aspects of the issue. The scientific community doesn't claim to. As a matter of fact, the prevailing sentiment is a humble one-- we don't understand everything about the atmosphere, so we shouldn't alter it recklessly.
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