The key science question for citizens and their representatives is not whether most recent warming is man - made but whether climate change, as Al Gore HAS put it, is a «planetary emergency... that threatens the survival of civilization and the habitability of the Earth.» (foxnews.com)
Analysis has shown that most the glacial retreat at Kilimanjaro occurred before 1953 (and therefore before most recent warming) and that the retreat has more to do with moisture in the air than with global warming. (climate-skeptic.com)
One of the main planks of the argument that CRF is responsible for the most recent warming is based on figure 14b in Veizer (2005), where there appears to be a trend in CRF from eg Climax neutron monitor (also, see plots at this URL). (realclimate.org)