Record level of greenhouse gases raise concern over climate change
The levels of gases in the atmosphere that drive global warming reached a record high last year.
The annual figures released by the World Meteorological Organisation -- the WMO -- showed that the volume of carbon dioxide or CO2, which is the primary gas emitted by human activities grew faster in 2012 than in the previous decade.
The WMO's annual greenhouse gas bulletin measures concentrations in the atmosphere, not emissions on the ground. It fired a warning for the future.