"Science always uses metaphor." -- James Lovelock

In your Chicago Sun-Times, Neil Steinberg knocks down a logical fallacy repeatedly employed by global warming deniers:

Current conditions do not refute long-term trends.

A bum can find a $20 in the street and think, "I'm rich!" But he is not rich, he's a poor man with $20.

This analogy so simple and strong that it may even be understood by Sun-Times' Canucknuckle-headed denier Mark Steyn.