New Scientist has gathered up "26 most common climate myths and misconceptions." Among them is the contention that Hurricane Katrina was caused by global warming. Not so fast!

The chaotic nature of weather makes it impossible to prove that any single event such as Hurricane Katrina is due to global warming. It is also impossible to prove that global warming did not play a part, so debates about the causes of individual events are futile.

Other environmentally thorny topics include Antarctica is getting cooler, not warmer, disproving global warming; Mars and Pluto are warming too; and It was warmer during the Medieval period, with vineyards in England.