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The top documents tagged [cormorants25 ppm]
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October 12, 1999: 6 billion! Now doubling every 61 years December, 2012: 7 billion!
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mass of the atmosphere: 5 x 10 18 kg mass of the atmosphere: 5 x 10 18 kg 1 ppm of this is 5 x 10 12 kg Tis is 5 x 10 9 tonnes Or: 5 billion tonnes
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