My point is mainly that many claims are based on bad science. Bad science may be true or false or any degree in between.
In a related thread on An Inconvenient Truth we are referred to a scientific article that claims that the tropics are expanding toward the poles. This is just another example of extreemly bad science. The tropics area or latitude has nothing to do with global warming and they do not expand or contract. They are the points where the sun's rays land at 90 degrees to the earth at least once a year. Any scientist should know this as fact and not make such stupid statements. When they do it calls to question anything else that they have to say.