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Surging carbon dioxide levels boosted greenhouse gases in the atmosphere to a new high in 2013, amid worrying signs that absorption by land and sea is waning, the UN warned Tuesday, September 9. “An alarm bell is ringing,” Michel Jarraud, head of the World Meteorological Organization (WMO), told reporters in Geneva. In its annual report on Earth-warming greenhouse gases in the atmosphere, the UN agency said concentrations of carbon dioxide (CO2), methane and nitrous oxide all broke records in 2013. “We must reverse this trend by cutting emissions of CO2 and other greenhouse gases across the board,” Jarrud said in a statement, and warned: “we are running out of time.”
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