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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 .What is the value of an intact rainforest?
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3 .From a people perspective, maybe it's more useful turned into lumber and cropland.
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4 .The responses to such arguments have often cited what are called ecosystem services.
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5 .These are the keys to life that natural systems provide for free think: breathable air and potable water.
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6 .Other counters point to the psychological benefits of the natural world.
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7 .Now we have a new reason for conservation: human health.
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8 .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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9 .And Dams irrigation projects upriver in Africa increase the population of malarial mosquitoes downriver.
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10 .These are just two of the examples from a new analysis in Proceedings of the National Academy of Sciences.
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11 .Consider big upheavals like global warming.
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12 .Climate change means more deadly heat waves, allergies, infectious diseases and, potentially, a breakdown in food supplies.
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13 .All obviously bad for human health.
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14 .Our understanding of these complex interactions is incomplete.
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15 .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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16 .A better understanding of nature's value will probably prove vital for human health in the 21st century.
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17 .Your minute is up, for Scientific American 60-Second Earth. I'm David Biello,
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