New Delhi, Sept. 15 -- California will extend a key climate program under a bill state lawmakers passed Saturday, sending the measure to Gov. Gavin Newsom, who has championed it as a crucial tool to respond to the Trump administration's environmental rollbacks.

The Democrat-dominated Legislature voted to reauthorize the state's cap-and-trade program, which is set to expire after 2030. Then-Gov. Arnold Schwarzenegger, a Republican, signed a law authorizing the program in 2006, and it launched in 2013.

The program sets a declining limit on total planet-warming emissions in the state from major polluters. Companies must reduce their emissions, buy allowances from the state or other businesses, or fund projects aimed at offsetting their emi...