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An amusing story on Science Daily says researchers have determined that the giant, herbivorous sauropods of the Mesozoic might have been responsible for the era’s warm climate. Well, not the dinosaurs themselves, but rather the methane-producing bacteria in their guts:
“A simple mathematical model suggests that the microbes living in sauropod dinosaurs may have produced enough methane to have an important effect on the Mesozoic climate,” said Dave Wilkinson of Liverpool John Moores University. “Indeed, our calculations suggest that these dinosaurs could have produced more methane than all modern sources — both natural and man-made — put together.”
So basically, dinosaur farts created global warming. That would be one stinky environment.
Wilkinson, Ruxton, and Nisbet therefore calculate global methane emissions from sauropods to have been 520 million tons (520 Tg) per year, comparable to total modern methane emissions. Before industry took off on modern Earth about 150 years ago, methane emissions were roughly 200 Tg per year. By comparison, modern ruminant animals, including cows, goats, giraffes, and others, produce methane emission of 50 to 100 Tg per year.
Out-gassing animals have been blamed before as the cause of our recent climate changes. According to this site,
According to the Food and Agriculture Organization of the United Nations (FAO) agriculture is responsible for 18% of the total release of greenhouse gases world-wide (this is more than the whole transportation sector). Cattle-breeding is taking a major factor for these greenhouse gas emissions according to FAO. Says Henning Steinfeld, Chief of FAO’s Livestock Information and Policy Branch and senior author of the report: “Livestock are one of the most significant contributors to today’s most serious environmental problems. Urgent action is required to remedy the situation.”
The site’s conclusion is to “Eat less meat and dairy products.” Now if dinosaurs did better in the hotter climate of the Mesozoic, then curiously the same advice would have been suitable for carnosaurs, because eating the sauropods could have reduced the global climate. Fewer herbivores equals fewer farts equals less methane in the atmosphere equals cooler temperatures. Somehow I can’t see a T. Rex nibbling on the Cretaceous equivalent of broccoli in order to keep a warmer neighbourhood.
Just another example of the wonderful delights we find in the world of science.
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