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1 .This is Scientific American's 60-Second Earth, I'm Karen Hopkin. Got a minute?
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2 .When we think about global warming, we tend to fret about things we can see: plants, animals, the polar ice caps.
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3 .But the effects of climate change may go much deeper: into the earth itself.
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4 .Because a new study shows that temperature controls where soil-dwelling microbes live.
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5 .The findings are in the journal Science.
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6 .Bacteria are key players in the formation of topsoil.
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7 .They add carbon and nitrogen, and extract nutrients.
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8 .Uprooting these microscopic residents could upset the land's fertility and lead to soil erosion.
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9 .To investigate how a rise in temperature might alter bacterial distribution in different desert climes, researchers surveyed the microbes present in a pinch of crust from several arid locations.
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10 .And they found that cooler deserts are ruled by one type of bacteria, and warmer ones are dominated by another.
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11 .If the climate models are correct, 50 years from now the heat-seeking bugs will have elbowed out those that prefer life a bit more chilly.
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12 .What this microbial coup will do to the planet's ecological health is not known.
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13 .But the results suggest that scientists interested in climate change need to dig in, because global warming is more than skin deep.
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14 .Thanks for the minute, for Scientific American's 60-Second Earth. I'm Karen Hopkin.
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