CO2 spikes again

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NOAA reports that carbon dioxide in the atmosphere rose 3.05 parts per million in 2015, the largest annual increase recorded at the Mauna Loa Observatory since it began in 1957. Last year was the fourth consecutive year that CO2 concentrations grew by more than 2 parts per million. More recently,  the change in average CO2 concentration from February 2015 till last month shows…
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