Concentrations of carbon dioxide surged at a record breaking speed in 2016, according to the annual Greenhouse Gas bulletin compiled by the World Meteorological Organization.
원문출처 : http://www.cnn.com/2017/10/30/europe/co2-levels/index.html
원문출처 : http://www.cnn.com/2017/10/30/europe/co2-levels/index.html