Anthony Watts has a summary of this paper, a link to a rebuttal, and some choice comments over at Watts up with that:
http://wattsupwiththat.com/2014/04/11/claim-odds-that-global-warming-is-due-to-natural-factors-slim-to-none/
Love Watts. The comments are great too. David l. had it exactly correct when he quoted Rutherford