California drivers are going to see a bump at the pump starting Jan. 1 – with a good chunk of the money going to kick-start Gov. Jerry Brown‘s struggling high-speed rail project.

Reason: Starting next year, tailpipe emissions from cars and trucks will come under California’s cap-and-trade program, which is designed to reduce greenhouse gases.

The result will probably be increased costs to gas wholesalers, who in turn will pass them along to drivers.

Estimates on the price vary. Industry insiders are predicting a jump of 15 to 20 cents a gallon, while clean-air advocates say it may be less.

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