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24 June, 06:09

If the atmospheric carbon concentration was 280 parts per million in 1750, what was the concentration in 2012?

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  1. 24 June, 09:52
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    The correct answer is "400 parts per million".

    Explanation:

    According to Jessica Blunden's article "2013 State of the Climate: Carbon dioxide tops 400 ppm", over the past decade the average rate of CO2 concentration in the atmosphere has triplet. This caused that by 2012, a new threshold has reached and the World Resources Institute reported a CO2 concentration of 400 ppm. Unfortunately by 2013, the CO2 concentration increased, and was 2.8 ppm higher than in 2012.
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