This is not true at all. During the recent period known as the Younger Dryas average global temps changed about 5°C over a few decades and then did it again in

This is not true at all. During the recent period known as the Younger Dryas average global temps changed about 5°C over a few decades and then did it again in the opposite direction 1000 years later. The post-industrial period is so short it wouldn't even register on most historical proxies.