Researchers have even suggested that a meteorite strike was the cause. climate changes and hunting by humans are two possibilities
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Leading cause with lots of evidence world wide. Climate Change is what happened AFTER the Strike, which was from comet debris and the strikes lasted perhaps 100 years. Most of North America, not covered by ice, was engulfed in fire storms which burned off 4% of Earth’s vegetation and lower atmospheric oxygen. Immediately after, the Earth was plunged into the Younger Dryas event which lasted 1000 years and was the coldest time ever.
Cosmic Debris?
An our millennials are worried about cow farts!