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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 .In the summer of 2012, the U.S.baked.
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3 .From the end of June through July, temperature records were set across the middle of the country.
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4 .Drought partnered with the heat to cause discomfort for individuals and misery for farmers.
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5 .And the cause may have been the record-setting meltdown of Arctic sea ice.
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6 .That's according to a new paper in the journal Nature Climate Change.
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7 .The loss of sea ice leads to a weakening of winds high in the atmosphere.
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8 .The reduced temperature difference between the Arctic and lower latitudes diminishes the jet stream as well.
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9 .It also moves the jet stream north, letting hot air sit longer.
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10 .Such a lessening of the jet stream may have been responsible for Hurricane Sandy turning ashore and wreaking havoc in New York City and New Jersey.
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11 .And the phenomenon extends beyond North America.
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12 .Weak jet streams have prolonged heat waves in Russia as well as parked downpours over Europe.
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13 .One thing's for sure: increasing concentrations of greenhouse gases in the atmosphere will continue to warm the Arctic and melt ice and snow.
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14 .And that could mean much hotter summers across the northern hemisphere.
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15 .Your minute is up, for Scientific American 60-Second Earth. I'm David Biello.
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