California's greenhouse-gas emissions will be cut to 1990 levels by 2020 under a bill passed Aug. 31, which Gov. Arnold Schwarzenegger (R) is expected to sign. The law will require the State Air Resources Board to regulate and limit gas emissions for landfills, cement kilns, oil and gas extraction and oil refineries. The energy industry will spend billions of dollars in upgrades and new projects to comply, estimates Joe Ronan, a senior vice president at Calpine Corp., San Jose. The Air Resources Board must publish a list of discrete early-action measures for emission reduction by June 2007.