The Carbon Brief: “Greenhouse gas levels in the atmosphere reached a record high in 2013, according to the latest measurements by the World Meteorological Organisation.”

“The amount of carbon dioxide in the atmosphere has reached 396 parts per million (ppm) – 42 per cent higher than pre-industrial levels.”

“WMO measurements revealed an increase in global carbon dioxide concentrations from 2012 to 2013 of almost 3 ppm. This is larger than recent annual increases of around 2.1 ppm and the largest annual increase since 1984.”