[Angus]

The thing with so called "experts" in any field is that they have to maintain their status and justify their existence by coming up with some theory or another presented under the guise that it is scientific "fact".

The truth is that all sciences are organic and evolving all the time, often rendering previous theories redundant. The fact that theories such as global warming are challenged and criticised is surely a good thing, since it ensures that nothing is taken for granted and the issue is always in the public arena for debate, and not simply taken at face value.