The world has entered a "new danger zone" with a record level of Earth-warming carbon dioxide in the atmosphere, UN climate chief Christiana Figueres said Monday.
United Nations Convention on Climate Change executive secretary Christiana Figueres speaks during a press conference during the UN's 18th Climate Change Conference in Doha on November 30, 2012. The world has entered a "new danger zone" with a record level of Earth-warming carbon dioxide in the atmosphere, Figueres said Monday.
With a CO2 level of 400 parts per million (ppm) announced last week, the highest in human history, the world "crossed an historic threshold and entered a new danger zone," she said in a statement urging policy action.
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