A new paper published in the International Journal of Climatology examines solar radiation at the Earth surface in Greece from 1993-2011 and finds a significant increase after 1990 of 0.33% per year. This upward trend in solar radiation would equate to about 14.1 Wm-2 over the past 18 years, dwarfing the alleged effect of CO2 at the Earth surface during that same period [0.13 Wm-2] by a factor of more than 108 times. The paper adds to many others showing that solar radiation at the Earth surface significantly increased beginning in the 1980's and could more than account for the tiny global warming observed [0.4C] since the ice age scare of the 1970's.
"solar constant" = 1361 Wm-2
[(1361-30%albedo)*.0033]/4 = 0.785 Wm-2 change in insolation [global average, would actually be higher for Greece being relatively close to the equator]
0.785*18 years = 14.1 Wm-2
Alleged forcing from CO2 change from 1993-2011 per the IPCC formula:
5.35*ln(391.62/357.07) = 0.49 Wm-2 at the top of the atmosphere
0.49/3.7 = 0.13 Wm-2 alleged CO2 forcing at the surface of the Earth
Prior posts on trends in solar irradiance and cloudiness