Nature World News: The amount of greenhouse gases in the atmosphere hit a new record last year, the World Meteorological Organization (WMO) announced Wednesday.
Carbon dioxide alone reached 393.1 parts per million in 2012, or 141 percent of the pre-industrial level. The latest reading follows a 2.2 parts per million increase between 2011 and 2012, representing a jump from the steady 2.02 upward climb that characterized the last decade. Emitted through human activities, namely the burning of fossil fuels, CO2 remains...