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Greenhouse Gases Hit Level Last Seen When Seas Covered Manhattan

  • WMO says CO2 concentration highest in at least 3 million years
  • ‘The window of opportunity for action is almost closed’
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Fighting Climate Change, Without the U.S.
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Greenhouse gas levels in the atmosphere reached a record not seen since sea levels were 10 meters to 20 meters (33 feet to 66 feet) higher than they are now, the World Meteorological Organization said in a report.

Concentrations of carbon dioxide and other Earth-warming gases rose last year and are 41 percent higher than in 1990, driving a long-term increase in the global temperature, the United Nations organization said in its annual assessment of the trend.