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Because there is no predictable upper limit, and any quick fix is at immediate risk of not being enough shortly later.

I think it's perfectly reasonable to postpone worrying about 50+ degrees until it's already shifted at least 5. If it turns out 5 is terrible, we'll have hundreds of years to implement plans to stop 50.

If you think 5 degrees is catastrophic, then sure worry about that in 2013. But it won't make the planet uninhabitable.

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