Earth-warming greenhouse gas concentrations hit record high in 2014: UN
In its annual report on Earth-warming greenhouse gases in the atmosphere, the World Meteorological Organization said concentrations of carbon dioxide (CO2), methane and nitrous oxide once again broke records last year.
WMO chief Michel Jarraud said in a statement that the world was moving into uncharted territory.
The report came as country envoys Monday gathered in Paris to iron out tough political questions ahead of a key summit tasked with sealing a climate rescue pact.
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