WASHINGTON (AP) — Most Americans are already feeling man-made global warming, from heat waves to wild storms to longer allergy seasons. And it is likely to get worse and more expensive, says a new federal report that is heating up political debate along with the temperature.

Shortly after the report came out Tuesday, President Barack Obama used several television weathermen to make his point about the bad weather news and a need for action to curb carbon pollution before it is too late.

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