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This is Scientific American 60-Second Earth. I'm David Biello. Your minute begins now.
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We are living during what seem to be the opening stages of the sixth mass extinction in our planet's 4.5 billion year history.
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Species of birds, fish, mammals and plants are disappearing at speeds rarely experienced, thanks in large part to human activities: pollution, climate change, habitat destruction and other damage.
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But extinction apparently does not mean less biodiversity, at least not yet.
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A new look at ecosystems from the poles to the tropics shows that losses in the number of species in any given place do not yet translate to large changes in the overall number of different species there.
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The study is in the journal Science.
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The researchers analyzed 100 surveys that followed more than 35,000 different species over various lengths of time.
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These long-term studies found that the number of different species in, say, a coral reef remains relatively constant.
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Because the loss of a species, either locally or entirely, is often balanced by the arrival of a new species.
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The meta-analysis showed that 40 percent of places had more species present, 40 percent had less and 20 percent were unchanged.
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In other words, the ecosystems of the current Anthropocene era are transformed, but just as diverse, so far anyway.
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We are living in a world of novel ecosystems.
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Your minute is up, for Scientific American 60-Second Earth. I'm David Biello.
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显示原文 =This is Scientific American 60-Second Earth. I'm David Biello. Your minute begins now.
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显示原文 =We are living during what seem to be the opening stages of the sixth mass extinction in our planet's 4.5 billion year history.
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显示原文 =Species of birds, fish, mammals and plants are disappearing at speeds rarely experienced, thanks in large part to human activities: pollution, climate change, habitat destruction and other damage.
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4 / 13
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显示原文 =But extinction apparently does not mean less biodiversity, at least not yet.
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显示原文 =A new look at ecosystems from the poles to the tropics shows that losses in the number of species in any given place do not yet translate to large changes in the overall number of different species there.
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显示原文 =The study is in the journal Science.
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显示原文 =The researchers analyzed 100 surveys that followed more than 35,000 different species over various lengths of time.
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显示原文 =These long-term studies found that the number of different species in, say, a coral reef remains relatively constant.
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显示原文 =Because the loss of a species, either locally or entirely, is often balanced by the arrival of a new species.
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显示原文 =The meta-analysis showed that 40 percent of places had more species present, 40 percent had less and 20 percent were unchanged.
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显示原文 =In other words, the ecosystems of the current Anthropocene era are transformed, but just as diverse, so far anyway.
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显示原文 =We are living in a world of novel ecosystems.
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13 / 13
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显示原文 =Your minute is up, for Scientific American 60-Second Earth. I'm David Biello.
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- 单句循环：关
- 单句循环：×3
- 单句循环：×5
- 单句循环：∞