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[–] zambeezy 0 points 2 points (+2|-0) ago 

Since 1880, so like 135 years...not really very long in the lifespan of the Earth now is it?

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[–] gtchessplayer [S] 3 points -3 points (+0|-3) ago 

So we can assess the temperature of previous millennia via proxies. It is less than idea, but it's still something.

Humans weren't dumping this much CO2 into the atmosphere thousands of years ago, so what does it matter what the temperature was 2k years ago? We can assess that humans are causing it today.

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[–] zambeezy 0 points 2 points (+2|-0) ago 

Because it establishes a better baseline. But yeah, let's ignore the fact that we know so very, VERY little about the earth's climate