Carbon dioxide continues its rise

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The atmospheric concentration of the greenhouse gas carbon dioxide has reached a new high, say US researchers. The figures - 378 parts per million (ppm) - were gathered by a Hawaiian lab regarded by experts as one of the most reliable in climate research. The rise in the past year is smaller than it was in the previous two years. But the trend remains upwards, as it has for every year since measurements began on top of the Mauna Loa volcano nearly half a century ago. The research was carried out by the US government's Climate Monitoring Diagnostics Laboratory, part of the National Oceanic and Atmospheric Administration (Noaa).