Here is the answer provided by Steve Maley on Quora. The response is in italics with my bolds and images.
Global Warming began in Muncie, Indiana on June 17, 1953 at 2:30 in the afternoon. It was a Tuesday.
Up until that time, weather was “average” all the time.
That is, except for the Dust Bowl, the Little Ice Age, Medieval Warm Period, etc.
Up until then, people had ideal, sustainable lifestyles. 90% of men spent all day in the fields looking at the backsides of two mules. Their spare time was spent chopping wood in hopes they could make it through another winter.
Women stayed at home and had babies. They had to have 8–10 because 2 or 3 of them wouldn’t live to see their 10th birthday.
Farm to Table was a thing. Since nobody had any money, it was a choice between raising your own food or starving.
Yes, it was an idyllic lifestyle. Damn fossil fuels screwed it all up.
How? By changing the atmosphere. Gases other than CO2 used to be 99.97% of the air we breathe. Now it’s 99.96%.