U.N. says 2005 set greenhouse gas record

Heat-trapping greenhouse gases in the atmosphere reached a record high in 2005 and are still increasing, the U.N. weather agency said Friday.

The measurements coordinated by the World Meteorological Organization show that the global average concentrations of carbon dioxide, or CO2, and nitrous oxide, or N2O, reached record levels last year and are expected to increase even further this year, said Geir Braathen, a climate specialist at the Geneva-based agency.

"There is no sign that N2O and CO2 are starting to level off," Braathen said at the global body's European headquarters. "It looks like it will just continue like this for the foreseeable future."