...I looked up Freeman Dyson on Wikipedia, which describes his views on "global warming" as below. If that is an accurate description of what he is saying now, it is actually quite reasonable (I had heard that he is just another contrarian). However, this also indicates that he is under the mistaken impression that concern about global warming is based on climate models, which in reality play little role in our understanding -- our understanding is based mainly on how the Earth responded to changes of boundary conditions in the past and on how it is responding to on-going changes.
If this Wikipedia information is an accurate description of his position, then the only thing that I would like to say about him is that he should be careful not to offer public opinions about global warming unless he is willing to first take a serious look at the science. His philosophy of science is spot-on, the open-mindedness, consistent with that of Feynman and the other greats, but if he is going to wander into something with major consequences for humanity and other life on the planet, then he should first do his homework -- which he obviously has not done on global warming. My concern is that the public may assume that he has -- and, because of his other accomplishments, give his opinion more weight than it deserves.