solar forcing and climate change
In P.R. Goode and E.Palle, Shortwave Forcing of the earth's climate: Modern and historical variations in the sun's irradiance and the earth's reflectance, Journal of Atmospheric and Solar-Terrestrial Physics (2007), doi: 10.1016/j.jastp.2007.06.011, the authors conclude: I quote,
..the Sun cannot have been any dimmer than it is at the most recent activity minima. We have also shown how concurrent changes in the Earth's reflectance can produce a much larger climate impact over relatively short time scales. Thus, a possible Sun-albedo link, would have the potential to produce large climate effects without the need for significant excursions in solar irradiance...Regardless of its possible solar ties, we have seen how the Earth's large scale reflectance - and the short wavelength part of the Earth's radiation budget is a much more variable climate parameter than previously thought and, thus, deserves to be studied in as much detail as changes in the Sun's output or changes in the Earth's atmospheric infrared emission produced by anthropogenic greenhouse gases....