record high in 2005 and are still increasing, the U.N. weather agency said Friday. The global average concentrations of carbon dioxide and nitrous oxide reached record levels last year and are expected to increase even further this year, said a climate specialist at the World Meteorological Organization.

“There is no sign that N20 and Co2 are starting to level off,” the specialist said, adding: “It looks like it will just continue like this for the foreseeable future.”