California Gov. Jerry Brown is aiming for the state to be carbon-neutral by 2045. Brown signed an executive order Monday announcing the goal to eliminate carbon emissions in the state within 27 years. He also signed a bill, SB100, making the state’s electricity completely emissions-free by 2045. The bill represents an ambitious move by the world’s fifth-largest economy. “It’s impossible to overstate how significant it is for a state as large and influential as California to commit to 100 percent clean energy,” the Sierra Club said in a statement.