"Research confirms how global warming links to carbon emissions"
http://www.sciencedaily.com/releases/2014/12/141201113036.htm
"Date: December 1, 2014
Source: University of Southampton
Summary: Research has identified, for the first time, how global warming is related to the amount of carbon emitted. A team of researchers has derived the first theoretical equation to demonstrate that global warming is a direct result of the build-up of carbon emissions since the late 1800s when human-made carbon emissions began. The results are in accord with previous data from climate models."