All hypothesis' have to be able to be disproved in order to be credible, that's basic science. The beauty of science is that it's open to criticism unlike religion or science fiction economics.
Due to the High number of experts that agree on the issue of man made climate change, it's safe to say that its a good bet
The "high number" consensus figure is a crock. Furthermore, claims that there is a "consensus" must be based on evidence, not used as a substitute for evidence.
You do make an important point about the fact that credible scientific theories need to be falsifiable. Unfortunately, the advocates for the theory of global warming have refused to say what the criteria should be. If it can't be falsified, it can't be verified.
Of course, you could use the benchmark for questioning the merits of the models that was set by Phil Jones, the director of the Climate Research Unit at East Anglia, in one of the leaked Climategate emails: "Bottom line: the 'no upward trend' has to continue for a total of 15 years before we get worried."
http://www.dailymail.co.uk/sciencet...-report-quietly-released--chart-prove-it.html
That 15-year criteria set by Jones has been met and surpassed.