The decrease in Earth’s reflectance from 1984 to 2000 translates into an albedo decrease equivalent to a forcing of 6.8W/m^2.
That is almost 3 times as much warming as claimed by the IPCC for warming caused by CO2 from 1850 – 2.4W/m^2.
http://hockeyschtick.blogspot.com/2011/05/study-finds-global-warming-from-natural.html
http://www.iac.es/galeria/epalle/reprints/Goode_Palle_JASTP_2007.pdf
sunshine hours 