A model designed to simulate the effects of changes in energy in our climate system. The units are arbitrary - the values are all relative to each other. Each Unit is approximately equal to 5.56e+22.
Reference used for rate of increase of greenhouse effect:
http://hyperphysics.phy-astr.gsu.edu/hbase/thermo/grnhse.html
Soot is an aerosol: https://www.sciencedaily.com/releases/2012/08/120830141339.htm