Thus the total net forcing thus far is between 0 % and 66 % of the forcing associated with a doubling of atmospheric CO2, with a most likely value of 34 %. (skepticalscience.com)
The thin colored bars indicate very likely value (more than 90 % probability). (skepticalscience.com)
The thicker colored bars indicate likely values (more than 66 % probability). (skepticalscience.com)