Presented largely without comment, for those who got caught up in the summer-of-the-shark-style "hottest summer ever" coverage this year. US only:
I think most would agree that the heat waves of 1936 had about zero to do with man-made CO2 (since it preceded significant increases in Co2 since 1950). It was just freaking hot. When it happened in 1936, people treated it as a natural disaster. Today, we would likely treat it as an excuse to shut down the world economy.
PS - Most warming data you see is biased by the fact that it relies on a lot of thermometers that exist today but did not exist in the 1930's. If you limit the official government data set to only thermometers that have existed since at least 1920 you get this picture of us "warming". This last year was historically quite hot, but not unprecedentedly so (again, US data only)