SACRAMENTO (AP) — As he was sworn in for a record fourth term, Gov. Jerry Brown charted an ambitious new goal on Monday for California in its fight against climate change, challenging the nation’s most populous state to increase renewable energy use to 50 percent in the next 15 years. Brown, a Democrat, specifically called for the state to increase renewable electricity sources, reduce petroleum use in vehicles, double the energy efficiency of existing buildings and make heating fuels cleaner by 2030.