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Methane production




http://www.newscientist.com/article/mg20627623.300-did-early-hunters-cause-climate-change.html

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?