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

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What is the value of an intact rainforest?

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From a people perspective, maybe it's more useful turned into lumber and cropland.

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The responses to such arguments have often cited what are called ecosystem services.

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These are the keys to life that natural systems provide for free think: breathable air and potable water.

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Other counters point to the psychological benefits of the natural world.

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Now we have a new reason for conservation: human health.

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Turns out forest fires set to clear land in Indonesia generate the kind of soot that lodges in lungs and shortens lives across Southeast Asia.

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And Dams irrigation projects upriver in Africa increase the population of malarial mosquitoes downriver.

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These are just two of the examples from a new analysis in Proceedings of the National Academy of Sciences.

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Consider big upheavals like global warming.

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Climate change means more deadly heat waves, allergies, infectious diseases and, potentially, a breakdown in food supplies.

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All obviously bad for human health.

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Our understanding of these complex interactions is incomplete.

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For example, a given forest clearing may be good for some people's well-being but not others, both now and in the future.

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A better understanding of nature's value will probably prove vital for human health in the 21st century.

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

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