An interesting article by the first US secretary of energy.  The rush to certainty about the human cause of global warming is more faith than fact. The Theology of Global Warming - It's based on politics, not science. by James Schlesinger 

"Much has been made of the assertion, repeated regularly in the media, that "the science is settled," based upon a supposed "scientific consensus." Yet, some years ago in the "Oregon Petition" between 17,000 and 18,000 signatories, almost all scientists, made manifest that the science was not settled, declaring: "There is no convincing scientific evidence that human release of carbon dioxide, methane, or other greenhouse gasses is causing or will, in the foreseeable future, cause catastrophic heating of the Earth's atmosphere and disruption of the Earth's climate."

If so many scientist are unconvinced why are we constantly being told the science is settled? Perhaps this debate is more about politics than it is about science. See my previous post.   Certainty, Power plays and the Smoking Gun of Global Warming.