According to little Mikey, the climate suddenly went nuts in the year 1910.
It isn’t clear what might have caused Mr. Climate to have a nervous breakdown then, because CO2 was hardly rising around that time.
So I spent the last 30 seconds researching the history of that year, and discovered that 1910 was the summer when the first night game was played at White Sox Park. The lights apparently made Gaia feel very romantic, and the rest is history.