The laboratory with the longest, continuous measure of the amount of carbon dioxide in the atmosphere has broken through a symbolic mark. The "Keeling Lab" in Hawaii has seen the daily average concentration of the gas rise above 400 parts per million for the first time. via Pocket http://www.bbc.co.uk/news/science-environment-22486153#sa-ns_mchannel=rss&ns_source=PublicRSS20-sa
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