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1 .This is Scientific American 60-Second Earth. I'm David Biello. Your minute begins now.
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2 .By about 10,000 years ago, nearly 100 species of large animals had been recently driven to extinction around the globe.
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3 .This march of megafauna mortality coincides suspiciously with the arrival of another large animal in their vicinity: humans.
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4 .The die off in South America included giant ground sloths and armadillo-like animals the size of cars known as glyptodonts.
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5 .And the deaths seem responsible for the dearth of nutrients in Amazon rainforest soils today.
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6 .So says a study in the journal Nature Geoscience.
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7 .Plainly put, these big animals disperse a lot of phosphorous in their feces.
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8 .Once the big animals are gone, there's no way for the phosphorous to get from one part of the rainforest to another.
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9 .As a result, the Amazon rainforest even today is struggling to recover from that loss of fertility.
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10 .Other parts of the world face the same poop paucity predicament, according to the researchers' model.
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11 .But the impact outside the Amazon was less severe, for reasons still unknown.
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12 .What is clear is that the impact of extinction reverberates down through the millennia,
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13 .a clear signal that we've been living in the Anthropocene for a while.
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14 .Your minute is up, for Scientific American 60-Second Earth. I'm David Biello.
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