段落1
This is Scientific American 60-Second Science. I'm Christopher Intagliata. Got a minute?
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Climate scientists forecast sea levels to rise anywhere from one to four feet by the end of the century.
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That's a pretty big range.
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And there's a good reason for that: there's a lot of uncertainty baked into climate models.
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Take, for example, the way climate models predict how trees respond to drought.
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"Drought in these models is treated as a light switch", either on or off,
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¡°but in the real world we know that drought damages trees, and it can take a while for trees to repair this damage and recover."
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William Anderegg, an ecologist at Princeton University.
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He and his colleagues examined tree ring data from more than 1,300 sites around the world.
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And by comparing the rings with known drought records they found that trees don't simply kick back into gear as soon as rains return.
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Drought actually puts the trees' water transport systems under a huge amount of tension, he says, causing air bubbles to leak in, which damages or blocks those pipes.
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"I often compare this to a sort of a heart attack for a tree.
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That in some cases it can be lethal and in some cases they can repair that blockage."
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That drought 'hangover' causes tree growth to lag five to ten percent below normal for several years following the dry spell.
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"This is a problem because forests currently take up about 25 percent of human emissions of CO2, which is an incredible break on climate change.¡±
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And the less CO2 the trees are able to take up, the warmer it gets.
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The findings appears in the journal Science.
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The thing this study makes clear, is that predicting climate change¡ is hard.
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"It's really hard.These models have an incredibly challenging task of representing processes that occur from a leaf scale to a continent scale in space.
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And from several seconds to hundreds of years or at least a hundred years in time."
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But maybe a better understanding of how much carbon trees soak up,
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and how much they don't, will make climate forecasting just a little bit easier.
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Thanks for the minute, for Scientific American 60-Second Science. I'm Christopher Intagliata.
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1 / 23
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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 / 23
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显示原文 =Climate scientists forecast sea levels to rise anywhere from one to four feet by the end of the century.
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3 / 23
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显示原文 =That's a pretty big range.
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4 / 23
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显示原文 =And there's a good reason for that: there's a lot of uncertainty baked into climate models.
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5 / 23
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显示原文 =Take, for example, the way climate models predict how trees respond to drought.
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6 / 23
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显示原文 ="Drought in these models is treated as a light switch", either on or off,
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7 / 23
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显示原文 =¡°but in the real world we know that drought damages trees, and it can take a while for trees to repair this damage and recover."
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8 / 23
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显示原文 =William Anderegg, an ecologist at Princeton University.
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9 / 23
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显示原文 =He and his colleagues examined tree ring data from more than 1,300 sites around the world.
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10 / 23
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显示原文 =And by comparing the rings with known drought records they found that trees don't simply kick back into gear as soon as rains return.
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11 / 23
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显示原文 =Drought actually puts the trees' water transport systems under a huge amount of tension, he says, causing air bubbles to leak in, which damages or blocks those pipes.
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12 / 23
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显示原文 ="I often compare this to a sort of a heart attack for a tree.
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13 / 23
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显示原文 =That in some cases it can be lethal and in some cases they can repair that blockage."
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14 / 23
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显示原文 =That drought 'hangover' causes tree growth to lag five to ten percent below normal for several years following the dry spell.
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15 / 23
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显示原文 ="This is a problem because forests currently take up about 25 percent of human emissions of CO2, which is an incredible break on climate change.¡±
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16 / 23
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显示原文 =And the less CO2 the trees are able to take up, the warmer it gets.
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17 / 23
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显示原文 =The findings appears in the journal Science.
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18 / 23
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显示原文 =The thing this study makes clear, is that predicting climate change¡ is hard.
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19 / 23
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显示原文 ="It's really hard.These models have an incredibly challenging task of representing processes that occur from a leaf scale to a continent scale in space.
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20 / 23
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显示原文 =And from several seconds to hundreds of years or at least a hundred years in time."
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21 / 23
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显示原文 =But maybe a better understanding of how much carbon trees soak up,
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22 / 23
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显示原文 =and how much they don't, will make climate forecasting just a little bit easier.
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23 / 23
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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
- 单句循环：×3
- 单句循环：×5
- 单句循环：∞