California governor signs bill aiming to double energy efficiency

Jerry Brown signs ambitious climate change measure - also intended to increase renewable electricity use to 50% - after political loss against oil interests

California's governor on Wednesday signed an ambitious bill to combat climate change by increasing the state's renewable electricity use to 50% and doubling energy efficiency in existing buildings by 2030.

Governor Jerry Brown approved the measure after losing a political battle against oil interests as he also tried to cut petroleum use by half in the most populous US state.