The IPCC certainly believes that climate change is a big issue, but the IPCC is a political institution not really a scientific one. It uses the science for its own ends which is why, for example, we've had cases of governments, Belgium, Germany, putting pressure on the IPCC to make their reports sound scarier than the scientific reality justifies. The much quoted 95% certainty that man influences climate figure is a classic example of this, it's a bit like getting people to say there is a 95% certainty that the sun will rise tomorrow. Well yes the sun will rise tomorrow, but that's not really the subject that's being debated is it? It's what the temperatures will be in the future. It's a slight of hand, they're saying there is 95% certainty that man influences climate. Well I'm surprised they couldn't get 100% of scientists to agree on that one, because it's a given. The question is the degree to which man influences the climate, and whether if it is anything we should worry about, and whether we should bombing the global economy into the dark ages to try and stop it. All the computer models that the IPCC has used in its 25 years of existence, all of them have predicted/forecast global warming much greater than has actually been observed, and this represents a problem because what it means is that all these insistent claims that we need to take urgent measures now to deal with this unprecedented problem seem to be based on junk science. The IPCC at the moment stands and falls on its computer models. There's no other evidence out there that global warming is any kind of problem, it exists only in the imaginations of the people who program those computer models and the scientists who contribute to the theory that anthropogenic CO2 is a problem. What we see in the latest reports is that the evidence suggests that the models aren't working, which means that the entirety of AGW theory is flawed.