'One of the famous characteristics of pseudo-science is that it is "unfalsifiable." That is, the theory is constructed in such a way that there is no evidence that could possibly refute it...So if the winter is warm, that's global warming, but if the winter is cold, that's global warming, too. If sea ice is disappearing, that's global warming, but if sea ice is increasing, that's global warming. Now we can see what they mean when the warmthers say that global warming is supported by an ironclad scientific consensus. The theory is so irrefutable that it's unfalsifiable! Which is to say that it has become a cognitive spaghetti bowl full of ad hoc rationalizations, rather than a genuine scientific hypothesis.'