One of Shakespeare's persistent themes in Hamlet is that when people set out to fool others, it will eventually catch up with them. Repeatedly he emphasises that "purposes mistook fall on their inventors' heads", that such people end up "hoist with their own petard", or get caught like a "woodcock" in their own trap.
There was a delightful example of this on our letters page last week, when that well-known propagandist for global warming, Bob Ward, tried to challenge
what I had written about the recent series of unusually cold winters in North America.
Mr Ward is employed by the Grantham Institute at the London School of Economics, sponsored by a climate change-obsessed billionaire, and challenges anyone who publicly questions global warming orthodoxy. His point last week was to claim that, contrary to what I had written, recent US winters have not been unusually cold at all.
But the only evidence he could cite to support his point was the latest figures from the US National Oceanic and Atmospheric Administration (NOAA), suggesting that seven out of the past 10 US winters have in fact been "warmer than average".
Comment: It's not just the US or even the northern hemisphere which is experiencing such harsh winters: