Concentration of CO2 in atmosphere hits record high: UN

"Concentrations of carbon dioxide in the atmosphere surged at a record-breaking speed in 2016," the World Meteorological Organization said."Globally averaged concentrations of CO2 reached 403.3 parts per million in 2016, up from 400.00 ppm in 2015 because of a combination of human activities and a strong El Nino event," it said. The Greenhouse Gas Bulletin,…