"Don't ask me. I am still trying to figure how all the glaciers that covered Indiana, Ohio, Michigan, Illinios and Wisconsin 20,000 years ago went. Seems there must have been a lot of global warming going on, but no sign of man."
They are all in a series of large holes in liquid form. Today we call them the great lakes. Of course some must have spilled into the ocean right over Niagra Falls.
Cute huh? :o)
So these huge bodies of ice just melted and became liquid? Why would they melt though? Did they anticipate man would invent the combustion engine in 19,000 years and forever turn the world in an unstoppable upward spiral of warmth?