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I read that as the warning was that the temperature would rise by 1 to 7 degrees during the next 30 years (i.e. 1989-2019), not since ~1850. It has definitely r
by marcus_holmes 3y ago
I read that as the warning was that the temperature would rise by 1 to 7 degrees during the next 30 years (i.e. 1989-2019), not since ~1850. It has definitely risen by >1 degree since ~1850, but most of that had already happened by 1989.
- nabla9 3y agoThese scenarios are based on the "The Business-as-Usual" assumption that is not 100% valid. In IPCC 1990 business-as-usual scenario C02 emissions are roughly 45 Gt today, in reality, it's 37 Gt. Probably the most important factor is that coal use has not increased to the levels predicted, because actions have been taken in the last decade or so.