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This is Scientific American 60-Second Science. I'm Christopher Intagliata. Got a minute?

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What human activity has the biggest impact on the planet?

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I took an informal poll of New Yorkers:

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"Driving, day to day commuting."

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"Eating too much meat."

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"Using too many resources, I think."

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"Factory farming."

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"Driving."

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Here're something I didn't hear: killing off the world's top carnivores, like tigers, wolves and bears.

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Scientists say it's an overlooked problem with effects that ripple through ecosystems in unexpected ways.

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When otters disappear, for example, urchins take over, decimating kelp forests.

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Researchers reviewed the conservation status of 31 of the world's largest carnivorous mammals.

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They found that some two-thirds are threatened, living on a fraction of their former range.

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And nearly all are decreasing in number, apart from a few exceptions, like grizzlies and black bears.

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Their analysis appears in the journal Science.

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The loss of top carnivores could alter the dynamics of disease and wildfires, they say, and have unintended consequences for ecosystems.

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So either we learn to coexist with these predators or their disappearance may come back to bite us.

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Thanks for the minute, for Scientific American 60-Second Science. I'm Christopher Intagliata.

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