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When hunters arrived in North America and drove mammoths and other large
mammals to extinction, the methane balance of the atmosphere could have
changed as a result, triggering the global cool spell that followed. The
large grazing animals would have produced copious amounts of methane, a
potent greenhouse gas, from their digestive systems.
Just out of morbid curiousity, what would the methane production numbers
work out to be for all those dinos?