I'm passionately in favour of scientific research, even research which doesn't have an obvious end, so long as it is academically rigorous and independent. I'd happily see my taxes spent in that way and cut back on other national projects (let's have self-funding for 'artists' - blow up Tate Modern). However, there appears to be a lot of pseudo-science attached to the IPCC and similar bodies for whom the notion of global warming is a cash cow.
Out of fairness to Arizona University, it is possible that the article which appears in Science (a reputable, peer-reviewed magazine, I believe) hasn't been accurately reported by the press. However, I don't see how Prof Overpeck (former joint chair of the IPCC) can justifiably say, "This is yet another paper that makes the future look more scary than previously thought by many". It is not responsible scientific commentary. He then goes on to say, "If anyone still doubts the link between CO2 and climate, they should read this paper." I wonder if the paper really does prove cause and effect as Prof Overpeck claims. Somehow, I doubt it. Previous IPCC claims have never been backed by convincing science and for that reason I am highly sceptical that this paper will actually prove what the IPCC claims it proves.