"Today's inconvenient fact:
There was a "consensus" opinion in the late 20th Century that previous warming periods dating back to the end of the last glacial advance were warmer than our current temps.
This is from the UN IPCC First Assessment Report (FAR):
"A global warming of larger size has almost certainly occurred at least once since the end of the last glaciation without any appreciable increase in greenhouse gases.
"A global warming of larger size has almost certainly occurred at least once since the end of the last glaciation without any appreciable increase in greenhouse gases.