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Record Set for Global Carbon Dioxide Levels

Global carbon concentrations in the atmosphere reached a record level in March, U.S. government statistics showed. For the first time since the government started tracking carbon dioxide in the atmosphere around the world, the monthly global average surpassed 400 parts per million. Carbon dioxide is a potent greenhouse gas that occurs in nature but is also a byproduct of burning fossil fuels such as oil and coal. The National Oceanic and Atmospheric Administration's Global...

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