What's Wrong with the Weather?

There's nothing unusual about unusual weather. But global warming, a volcano and a stray ocean current may be making things even freakier.

Just when summer should have been coming in, it snowed last week in Colorado, punctuating several days of unseasonable 32 degrees C (90 degrees F) weather with enough snowfall to close three mountain highways. Paris was hit with a torrential rainstorm -- the worst in a decade -- that crippled the city, poisoned the Seine with sewer effluent, and clogged the river with 300 tons of dead fish. In one hour in early May, a squall dumped a record 110 mm (4 1/3 in.) of rain on Hong Kong, turning steep city streets into rushing rivers and killing five. In the...

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