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I've got no horse in the game, so a determination that global warming is a net negative is a conclusion I'm willing to accept. I'll only get there if the debate is had though, and that involves acknowledging benefits from warming too.
Key to convincing me that there is a problem developing is determining when warming is projected to become a net negative assuming current projected trends. That requires reasonable effort to consider the most serious negative impacts weighed against the most beneficial ones. Talk of polar bear habitat is distracting because it has nothing to do with human well-being.
Certainly it makes sense to me that rapid change tends to be harmful/stressful for most creatures.
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