Science is not science when it starts with a premisis and then works to a conclusion. A good example of this is what I argued a short time back in the evolution thread. Just recently a UW scientist came out with the theory that if life had existed on Mars, the last probe would have killed any existing life present. This is because the method to extract any life was based on the premises that any life would be similar to life on earth, which, given the conditions, it couldn't have. Simply put, as the scientist said, the search for life was to earth-based in its concept. My thought has always been that if a person believes in evolution then one must believe life occurred through random occurences under the existing conditions. Why then, considering how different the conditions are on mars or other planets, do we suppose life would take a similar form? By assuming that life would evolve or exist in the same or even similar forms, giving the extemely different conditions, would give more credence to a designer then it would to a random process, ie. evolution. Science does the best it can with the knowledge it has, but must except the fact that there is much unknown. They must approach each problem with an open mind and be accepting of the endless possibilities, something that, in my opinion, is not done. Ask most scientists if God exists, they will laugh at you. But ask any of them to prove he doesn't exist. They may point to a lack of evidence, or the problems with existing religions or creationism, but in the end they can't prove he doesn't. An adequet answer would be, I don't beleive because I have seen no evidence to draw me to that conclusion, is it possible yes, but in my opinion not probable. They may even think you are foolish for your belief. All ok and scientifically valid. But to dismiss the unknown, is to prove your prejudices.
In the theory of Global Warming, as in all science, there are probabilities, but there are also possibilities. Nothing is harmed in discussing both, with appropriate weight given to each.