WASHINGTON — As the Senate debates a major bill this week designed to curb the emissions of carbon dioxide believed to cause global warming, the man on the spot is Democratic Sen. Sherrod Brown of Ohio.

Although environmentalists acknowledge that the bill has no chance of congressional passage this year, they are pressing Brown to support the measure.

But Brown is being tugged in the opposite direction by industry and many labor unions warning that the bill would require such huge reductions in carbon dioxide emitted by utilities and industries that Ohio would suffer a major loss in jobs.

"I want to vote for a climate-change bill," Brown said in an interview last week.

But he added that the bill needs to make certain that "homeowners' electrical bills are manageable and Ohio's industries aren't hurt. This bill goes a way toward that, but we've got to do a lot more."

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