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This is Scientific American 60-Second Earth. I'm David Biello. Your minute begins now.
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Without industrially created fertilizer, one third of the world's population would starve to death.
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Since Fritz Haber and Carl Bosch came up with a way a century ago to wrest nitrogen from the air and turn it into fertilizer for plants, food supplies have exploded.
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But a lot of fertilizer applied to cropland simply washes off and fertilizes blooms of algae instead.
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When the bloom dies, other microbes move in to feast, in the process sucking all the oxygen out of the surrounding waters.
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The result: dead zones that lay waste to any sea life that could not flee.
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And such dead zones are proliferating.
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Now research shows that a vast store of nitrogen is waiting in the soil to create new dead zones for decades to come.
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French scientists traced nitrogen fertilizer and found that roughly 15 percent of the nitrogen applied in 1982 was still sitting in the soil today.
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Their report is in the Proceedings of the National Academy of Sciences.
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The research suggests that existing soil nitrogen could continue to flow to the sea for decades.
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A good reminder that our actions today have environmental consequences that our grandchildren will have to deal with.
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Your minute is up, for Scientific American 60-Second Earth. I'm David Biello.
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1 / 13
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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 =Without industrially created fertilizer, one third of the world's population would starve to death.
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显示原文 =Since Fritz Haber and Carl Bosch came up with a way a century ago to wrest nitrogen from the air and turn it into fertilizer for plants, food supplies have exploded.
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4 / 13
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显示原文 =But a lot of fertilizer applied to cropland simply washes off and fertilizes blooms of algae instead.
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5 / 13
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显示原文 =When the bloom dies, other microbes move in to feast, in the process sucking all the oxygen out of the surrounding waters.
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显示原文 =The result: dead zones that lay waste to any sea life that could not flee.
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7 / 13
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显示原文 =And such dead zones are proliferating.
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显示原文 =Now research shows that a vast store of nitrogen is waiting in the soil to create new dead zones for decades to come.
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9 / 13
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显示原文 =French scientists traced nitrogen fertilizer and found that roughly 15 percent of the nitrogen applied in 1982 was still sitting in the soil today.
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10 / 13
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显示原文 =Their report is in the Proceedings of the National Academy of Sciences.
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显示原文 =The research suggests that existing soil nitrogen could continue to flow to the sea for decades.
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12 / 13
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显示原文 =A good reminder that our actions today have environmental consequences that our grandchildren will have to deal with.
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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
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