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This is Scientific American 60-Second Science. I'm Christopher Intagliata. Got a minute?
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Parts of the planet warm and cool during El Nino and La Nina.
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And infectious diseases also wax and wane in step with the climate cycle.
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Take malaria, shown to spike in northern Venezuela during cool, La Nina conditions.
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Or flu pandemics, which often follow months after La Nina sets in.
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Now researchers have linked another public health risk to El Nino climate cycling: poisonous viper bites.
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Their study area was Costa Rica, where health centers keep rigorous records on snakebites.
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They compared nine years of those snakebite records, including some 6,500 bites to climate data over the same period.
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And they found that snakebites were two to three times as prevalent in the hottest and coldest years of the El Ni?o climate cycle.
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Sounds counterintuitive, you might expect the climate extremes to have opposite effects.
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But the researchers say in hot, dry years, plant productivity peaks, driving an increase in the number of rodents, aka snake food, and potentially increasing the number of snakes.
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And snakes tend to move around more in hot, dry weather, increasing chances they'll encounter and attack an unlucky farmer.
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In cold, wet years, on the other hand, prey numbers plummet forcing snakes to travel beyond their usual slithering grounds to eat, again increasing chances of an unlucky meeting.
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The study is in the journal Science Advances.
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The researchers also found two more variables that correlate strongly with Costa Ricans' odds of being bit: poverty and destitute housing.
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A reminder that, when it comes to dangers from environmental disruption, it's often the least fortunate who are at the greatest risk.
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Thanks for the minute, for Scientific American 60-Second Science. I'm Christopher Intagliata.
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1 / 17
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显示原文 =This is Scientific American 60-Second Science. I'm Christopher Intagliata. Got a minute?
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2 / 17
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显示原文 =Parts of the planet warm and cool during El Nino and La Nina.
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3 / 17
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显示原文 =And infectious diseases also wax and wane in step with the climate cycle.
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4 / 17
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显示原文 =Take malaria, shown to spike in northern Venezuela during cool, La Nina conditions.
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5 / 17
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显示原文 =Or flu pandemics, which often follow months after La Nina sets in.
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6 / 17
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显示原文 =Now researchers have linked another public health risk to El Nino climate cycling: poisonous viper bites.
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7 / 17
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显示原文 =Their study area was Costa Rica, where health centers keep rigorous records on snakebites.
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8 / 17
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显示原文 =They compared nine years of those snakebite records, including some 6,500 bites to climate data over the same period.
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9 / 17
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显示原文 =And they found that snakebites were two to three times as prevalent in the hottest and coldest years of the El Ni?o climate cycle.
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10 / 17
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显示原文 =Sounds counterintuitive, you might expect the climate extremes to have opposite effects.
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11 / 17
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显示原文 =But the researchers say in hot, dry years, plant productivity peaks, driving an increase in the number of rodents, aka snake food, and potentially increasing the number of snakes.
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12 / 17
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显示原文 =And snakes tend to move around more in hot, dry weather, increasing chances they'll encounter and attack an unlucky farmer.
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13 / 17
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显示原文 =In cold, wet years, on the other hand, prey numbers plummet forcing snakes to travel beyond their usual slithering grounds to eat, again increasing chances of an unlucky meeting.
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14 / 17
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显示原文 =The study is in the journal Science Advances.
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15 / 17
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显示原文 =The researchers also found two more variables that correlate strongly with Costa Ricans' odds of being bit: poverty and destitute housing.
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16 / 17
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显示原文 =A reminder that, when it comes to dangers from environmental disruption, it's often the least fortunate who are at the greatest risk.
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17 / 17
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显示原文 =Thanks for the minute, for Scientific American 60-Second Science. I'm Christopher Intagliata.
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- 单句循环:关
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- 单句循环:∞