California is aiming for its emissions to be at 1990 levels by 2020 and to be 40% below 1990 levels by 2040 below 1990 levels. The state of California has a population of 38 million and an economy about 30% larger than Australia’s.
… By 2030 California will increase from one-third to 50% of electricity derived from renewable sources; reduce petroleum use in cars and trucks by up to 50% and double the efficiency savings from existing buildings
(Climate Spectator: John Conroy:30 April 2015)
BBC News: 29 April 2015