"Climate scientists don't know why, but, starting 20 millennia ago, the earth’s climate began to warm."
Maybe it's just something the Earth does.
Maybe it's just something the Earth does.
The Great Lakes basins were caused by glaciers. They're not called Great for no reason - they're huge, and some are deep. They "contain 21% of the world's surface fresh water by volume."
It's hard to imagine Earth being covered by ice down to 42 degrees latitude. The more ice, the more reflection of solar rays (albedo.)