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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 .The river animals have it worst.
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3 .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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4 .That's not three-quarters of species, mind you, it's three-quarters of the individuals in a given population.
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5 .And it's not just the rivers.
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6 .Nearly 40 percent of both land and sea animals, from sardines to elephants, have disappeared over the same time span.
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7 .The numbers are from a new report from the conservation group World Wildlife Fund.
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8 .These lost animals have been replaced by either people or our domesticated animals--chickens, cows and pigs, among others.
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9 .Farms to feed people displace forests that feed wildlife.
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10 .And people also eat wildlife directly, from fish to bushmeat.
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11 .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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12 .But there is hope.
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13 .The vast majority of these beleaguered species are not extinct.
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14 .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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15 .Exporting that trend could help stave off the gathering sixth mass extinction.
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16 .Your minute is up, for Scientific American 60-Second Earth. I'm David Biello.
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