| http://www.w3.org/ns/prov#value | - About 55 million years ago, the Earth burped up a massive release of carbon dioxide into the atmosphere ??? an amount equivalent to burning all the petroleum and other fossil fuels that exist today. ???And we don???t know where it came from,??? says Will Clyde, associate professor of geology. ???This is a big part of the carbon cycle that affected the climate system, and we don???t understand it.?
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