Popper's Falisifcationalism:If T(Theoretical Statement) -> ~O(observational Statement)
Example:
If Solar activity drives climate change -> It is not the case that low solar activity will correlate with high temperatures.
By modus tollens, the observation that:
O
...implies:
~ T
which is to say that our theoretical statment has been falsified/refuted.
For example:
There have been no sunspots for almost 42 days and there are none in the offing and July 2009 was the second hottest July on record.
implies:
Anthony Watts is fucked up in the head.
Q.E.D
Of course, that's the "side of a cracker jack box" version of Karl Popper's Falsificationism. But WUWT is side of "side of a cracker jack box" science.