By William Yardley, The New York Times

After 32 years of hunting ducks here in the wetlands of west-central Missouri, Chuck Geier knows when temperatures will drop and waters will freeze. That means he also knows when the birds will fly and hunting will be best.

Except that now much of what he knows is in question.

"It used to be by Dec. 6, this place was frozen," said Mr. Geier, 51, a national sales manager for a telecommunications company. "That's not true anymore."

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