Solar activity is storms ON THE SUN. It doesn't cause warming.
Solar radiation is radiation from the Sun received ON EARTH. That's what causes the Earth to warm.
Statements about solar activity are meaningless with regard to global warming.
Solar radiation (also called solar forcing by scientists), which is what causes warming, has been decreasing slightly for many years.
Proof here:
"Recent oppositely directed trends in solar
climate forcings and the global mean surface
air temperature", Lockwood and Frolich (2007), Proc. R. Soc. A
doi:10.1098/rspa.2007.1880
http://www.pubs.royalsoc.ac.uk/media/proceedings_a/rspa20071880.pdf
News article at:
http://news.bbc.co.uk/1/hi/uk/6290228.stm
So why is the Earth warming? Greenhouse gases hold more of heat caused by solar radiation to be kept on Earth.
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