The sun has gradual decreased over this half billion years and science has shown that the concentration of CO2 when compared to the output of the sun equals the temperature of the earth. (wattsupwiththat.com)
Before he 1950 ′ the earlier year was consistently warmer than the latter year and after a period of roughly equal temperatures to about 1970, the latter years have (so far) been consistently warmer then the earlier years. (realclimate.org)
Notice that when the absorptivity and emissivity are equal the temperature T1 is pretty much independent of the actual value of emissivity / absorptivity — why is that? (scienceofdoom.com)