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Researchers at the National Oceanic and Atmospheric Administration Climate Monitoring Diagnostics Laboratory on Mauna Loa volcano in Hawaii say the atmospheric concentration of carbon dioxide (CO2) there has reached a new high of 378 parts per million. They also report that the annual growth rate of CO2, which has increased every year since 1958, has been about twice as high in the past decade as it was in the 1960s. However, the increase in the past year was lower than in the previous two years. The Mauna Loa lab, located 3,500 meters (11,500 feet) above sea level, is ideal for atmospheric research because there is no obvious pollution source or natural sink, such as a forest, nearby. |