BERKELEY, Calif. -- The San Francisco Bay Area city of Berkeley will decide whether to slap stickers on gas pumps warning that burning fuel contributes to global warming in a plan that's a first of its kind in the country.

The Berkeley City Council is expected to vote Tuesday night on whether to move forward with the proposal to put climate-change warning labels on gas pumps citywide. San Francisco is drafting a similar ordinance that officials could vote on by next spring.

A spokeswoman for the Western States Petroleum Association, an oil-industry lobbying group, has said the labels reflect the state's and Berkeley's opinions and would force "unwanted speech in violation of the First Amendment."

The labels are part of a voter-approved city plan to reduce emissions by 33 per cent between 2000 and 2020.