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This is Scientific American 60-Second Earth. I'm David Biello. Your minute begins now.

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The river animals have it worst.

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Thanks to water extraction, dam building and other river-changing pursuits, more than three-quarters of river amphibians, fish and mammals have disappeared since 1970.

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That's not three-quarters of species, mind you, it's three-quarters of the individuals in a given population.

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And it's not just the rivers.

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Nearly 40 percent of both land and sea animals, from sardines to elephants, have disappeared over the same time span.

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The numbers are from a new report from the conservation group World Wildlife Fund.

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These lost animals have been replaced by either people or our domesticated animals--chickens, cows and pigs, among others.

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Farms to feed people displace forests that feed wildlife.

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And people also eat wildlife directly, from fish to bushmeat.

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As a result, the survey finds fewer and fewer individuals among more than 3,000 species and 10,000 populations surveyed.

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But there is hope.

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The vast majority of these beleaguered species are not extinct.

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And in rich regions like the U.S., Europe and Japan, wildlife numbers are actually increasing: coyote, deer, turkey and other forest animals, for example, as the forest regrows along the east coast of North America.

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Exporting that trend could help stave off the gathering sixth mass extinction.

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Your minute is up, for Scientific American 60-Second Earth. I'm David Biello.

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