WASHINGTON — Energy and climate change legislation unveiled yesterday in the Senate would create a $3 billion tax-credit bond program for vehicles powered by natural gas, allow private-activity bond financing for advanced nuclear power facilities, expand a nuclear loan guarantee program, and provide $2 billion of competitive grants for transportation projects.

The bill, drafted by Sens. John Kerry, D-Mass., and Joseph ­Lieberman, I-Conn., comes during an election season when lawmakers may be reluctant to support a climate-change overhaul, Kerry acknowledged during a briefing.

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