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CO2 levels reach monthly record 7th May 2015

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Global carbon dioxide (CO2) concentrations have reached a new record of 400 parts per million (ppm) this month.

The US National Oceanic and Atmospheric Administration (NOAA) said it was the first month that the entire globe reached 400ppm, levels that haven’t been witnessed for approximately 2 million years. This is believed to be a very significant milestone which was firstly achieved in the Arctic in 2012, and then at Mauna Loa (Hawaii) in 2013.

CO2 concentrations have now risen by more than 120 ppm since pre-industrial times with half of that rise occurring post 1980.

CO2 air samples are taken from 40 locations around the globe and this month was the first time they all exceeded 400 ppm.

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