Global atmospheric greenhouse gas concentrations reach record levels
NOV 11, 2015
DOI: 10.1063/PT.5.029367
New York Times : According to the annual Greenhouse Gas Bulletin released Monday by the World Meteorological Organization, global concentrations of carbon dioxide in Earth’s atmosphere rose above 400 ppm for the first time in early 2015. The report also shows that methane and nitrous oxide reached record levels in 2014. For CO2, the 400-ppm barrier is an arbitrary marker set by scientists and politicians, but reaching the symbolic level is still significant—prior to 1750 the level was below 278 ppm.
© 2015 American Institute of Physics
