ESSD
WEBMay 8, 2015 · The global atmospheric CO 2 concentration reached ± ppm averaged over 2013. We estimate that EFF will increase by % (–%) to ± GtC in 2014 ( ± GtCO 2 yr −1 ), 65% above emissions in 1990, based on projections of world gross domestic product and recent changes in the carbon intensity .