Scientists have found atmospheric carbon dioxide levels have from 280

Many trees lose their leaves in the fall. Scientists have measured atmospheric carbon dioxide and found there to be seasonal
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13 of 2813 of 28 ItemsQuestion Marine scientists are monitoring atmospheric levels of carbon dioxide. As atmospheric CO2 levels
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Climate scientists have observed seasonal changes in atmospheric carbon dioxide concentration. In the Northern Hemisphere, they
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Climate scientists have observed seasonal changes in atmospheric carbon dioxide concentration. In the Northern Hemisphere, they
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limate scientists have observed seasonal changes in atmospheric carbon dioxide concentration. In the Northern Hemisphere, they
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Climate scientists have observed seasonal changes in atmospheric carbon dioxide concentration. In the Northern Hemisphere, they
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Climate scientists have observed seasonal changes in atmospheric carbon dioxide concentration. In the Northern Hemisphere, they
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Climate scientists have observed seasonal changes in atmospheric carbon dioxide concentration. In the Northern Hemisphere, they
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Climate scientists have observed seasonal changes in atmospheric carbon dioxide concentration. In the Northern Hemisphere, they
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Climate scientists have observed seasonal changes in atmospheric carbon dioxide concentration. In the Northern Hemisphere, they
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