WASHINGTON — Ignoring a Republican boycott, Senate Democrats pushed a precedent-setting climate bill through a key committee Thursday.

Rep. Barbara Boxer, chairman of the Senate Environment & Public Works Committee, had delayed the crucial vote for days because of a Republican protest over whether the cost of the legislation had been fully examined. But the California Democrat moved quickly to pass the bill, which for the first time would set mandatory limits on heat-trapping gases, without any of the seven GOP senators on the panel present. The measure cleared the panel on a 11-1 vote.