California Gov. Jerry Brown has been sworn in for an unprecedented fourth term with a sweeping plan to address climate change. In his inaugural speech, Brown said California must lead the way if the world is to limit global warming to two degrees Celsius.

Gov. Jerry Brown: “I propose three ambitious goals to be accomplished within the next 15 years: first, increase from one-third to 50 percent our electricity derived from renewable sources; two, and even more difficult, reduce today’s petroleum use in cars and trucks by up to 50 percent; three, double the efficiency of existing buildings and make heating fuels cleaner.”