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Please read the IPCC's AR5 WG2 report on impacts, adaptation and vulnerability.
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We are not just comparing our temperatures to the last 100 years or so, we have good temperature records dating back to ~900,000 years and records of varying quality dating back tens of millions of years.
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Yes, we can stop temperatures from rising above a certain point.
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We would be fairly okay if temperatures stopped rising at 1 degree but they're not going to stop rising at 1 degree, that is politically, socially and economically impossible.
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Again, please refer to the WG2 report.
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Because the climate system is extremely complex and there are all sorts of positive and negative feedback effects in play. Consider this: if you've got more warming, you've got more evaporation and hence more water vapour in the atmosphere that is able to fall as snow over ice sheets. This is not the mechanism that has resulted in the behaviour of the Antarctic sea ice that you've mentioned but the point I'm trying to make is that it's not as simple as average global temperature rise > all ice immediately melts.
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Who else is going to make these decisions if it's not politicians?
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