From the article:

"The researchers found that the greenhouse gas methane produced by all sauropods across the globe would have been about 520 million tons per year, a number on par with the total amount of methane currently produced by both natural and man-made sources. [Album: World's Biggest Beasts]"

Indeed Walt Kelly was correct. "We have met the enemy and he is us."

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Question: would that measure be in long or short tons, does anyone know? I'm gonna work it out in ounces and your answer could make a considerable difference to the final answer.