UNITED NATIONS, Nov. 20 (UPI) -- The amount of greenhouse gases in the atmosphere reached a record high in 2011, a report from the U.N. World Meteorological Organization says.
The WMO's 2011 Greenhouse Gas Bulletin notes about 375 billion tons of carbon have been released into the atmosphere as CO2 since the start of the industrial era in 1750, mostly from the burning of fossil fuels.