[AndrewDucker]

Loads: https://en.wikipedia.org/wiki/Global_temperature_record

Do bear in mind that most of the costs of global warming are based around:

1) It is happening much faster than we can cope with. If it was happening over 10,000 years then we'd slowly adapt. Or die out. One or the other.

2) Our cities are mostly built on coastlines, and will therefore be hit dramatically by severe weather and by sea rises.