AT NOON on May 4th the carbon dioxide concentration in the atmosphere around the Mauna Loa Observatory in Hawaii hit 400 parts per million (ppm).
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The average for the day was 399.73 and researchers at the observatory expect this figure, too, to exceed 400 in the next few days.
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The last time such values prevailed on Earth was in the Pliocene epoch,4m years ago, when jungles covered northern Canada.
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第六十八篇: 全球变暖
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