The head of the Intergovernmental Panel on Climate Change, the entity whose reports have been subject to significant criticism lately, says the group now “welcomes” vigorous debate on the science of climate change. Some people may be skeptical of that statement, because it certainly appears that the IPCC and other groups have tried to quash any debate in the name of “consensus.” But let’s accept what the IPCC head now says at face value. I think all that global warming skeptics have sought is an honest scientific debate about whether human activities in fact are responsible, in whole or in part, for any global warming. If the scientific debate is an honest one, that is all anyone can ask.