claim: In its 5th assessment report in 2013, the IPCC estimated that human emissions are probably responsible for more than half of the observed increase in global average temperature from 1951 to 2010.
evidence: In the IPCC Fifth Assessment Report the increase in CO2 was estimated to be responsible for 1.82 W·m2 of the 2.63 W·m2 change in radiative forcing on Earth ( about 70% ).