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Is the anthropogenic climate change hypothesis falsifiable?

I am asking this within the context of the scientific method. Integrity demands that a scientist, when proposing a hypothesis, list the conditions whereby the hypothesis would fall apart:

We believe that this hypothesis sufficiently describes the reality we are studying, but if anybody can demonstrate any of conditions a, b, c, d or e, our hypothesis is fatally compromised and it's back to the drawing board.

So, AGW folks: can you name any condition (series of weather events, temperature trends, etc.) that would make you doubt the current orthodoxy, or are we witnessing the most bulletproof hypothesis ever?