I've read recently that this same study was repeated this year (don't have the link), and the result dramatically different given the recent findings on the solar impact of global warming.

http://epw.senate.gov/public/index.cfm?FuseAction=Minority.B... http://www.sciencedaily.com/releases/2003/03/030321075236.ht... http://www.aip.org/pnu/2003/split/642-2.html

Studies: http://www.standaard.be/Artikel/Detail.aspx?artikelid=B18307... http://www.sciencedaily.com/releases/2007/08/070801174450.ht... http://www.sciencedaily.com/releases/2007/08/070801175711.ht...