I really don't know enough about the science to argue the this effectively from a sceintific side, but if I remember right, everyone was freaking out about global cooling in the early 70's. Point is, while it does seem to be fairly solid science, there still are people out there with valid opposing views. What harm is there in letting them talk. If, the opposing views have so little to stand on, it makes the other side even stronger. Debating an issue almost always results in clarification and strengthening of arguements. The refusal of debate usually is a result of fear or narrow minds. I know I have learned much by listening to people who I adversly disagree with than with people who I agree with. Being a conservative in a fundamentalist church, it I have fought all my life with people who refuse to listen to any veiw other than there own and fear anyone who doesn't believe the way they do. The older I get, the more I see that extremes act the same way, and that most things in life are formed in a circle. Kind of like love and hate are very close, radicals on both sides of the fence have more in common then anyone wants to ever admit. Both rule by fear and limiting knowledge.