CBC News
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Global carbon dioxide levels have surpassed 400 parts per million, which scientists call 'uncharted territory.'


Global carbon dioxide levels reach 'uncharted territory'
Global carbon dioxide levels in the atmosphere have surpassed 400 parts per million, and will almost certainly remain there indefinitely, according to new numbers from the Scripps carbon dioxide monitoring program at the Mauna Loa observatory in Hawaii.
CBC.CA