Hello Al,
There are also volcanoes. The Toba Volcano (Indonesia) super eruption 74,000
years ago nearly wiped out humans, there were only a few thousand Homo
Sapiens left according to genetic analyses and other studies. People
couldn't survive the volcanic winter.
Phil Whitmer
Joshua Tree Earth & Space Museum
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Hi Phil and all,
You mentioned other factors in your post but I'll include cycles in the
Sun also can have a big effect on weather as well as the ones you
mentioned.
Pretty hard to study something as old as the Earth system by observers
who are here only a very short span of that time. There have been many
heating up periods followed by colder cycles and probably will be for
eons.
AL Mitterling
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