The IPCC reports are thousands of pages, so it's not surprising that there are errors. You can find errors in a large fraction of scientific papers if you look hard enough.<p>The relevant question is whether there are more errors in the papers that support the idea of global warming than those that don't. Just judging from what I've seen, the complete crackpot papers (like this one: <a href="http://arxiv.org/abs/0707.1161v4" rel="nofollow">http://arxiv.org/abs/0707.1161v4</a>) are in the second category.