Apparently Robert Mueller, a quasi-critic of the climate science community, attempted to independently confirm average global temperature history. He did so with the backing of well known climate science deniers. His results were published recently and to the chagrin of the denialists his findings confirmed what the non-conspiracy theorists have long known. A rapid increase in global temperature since 1950. A video overview below.
So the focus of science denial really needs to move at this point. There's now really no denying that the change is occurring and it is relatively rapid. I suppose they'll need to emphasize other claims. Either it's not man made or it's just not a big deal.