Greenhouse gas concentration highest ever-UN agency

GENEVA, Nov 23 Reuters - Concentrations of greenhouse gases, the major cause of global warming, are at their highest levels ever recorded and are still climbing, the U.N. World Meteorological Organisation (WMO) said on Monday.

The head of the agency, Michel Jarraud, said the trend could be pushing the world towards the most pessimistic assessments of the rise in temperatures expected in coming decades and said this underlined the need for urgent action. (For WMO bulletin go to www.wmo.int/gaw ) (Editing by Jonathan Lynn and Tim Pearce) ((robert.j.evans@thomsonreuters.com; tel.: +41 22 733 38 31))