Support investment in Geothermal energy development. California already has some of the largest geothermal energy developments in the world, but they aren't as trendy as solar and wind.
Spread the word! Geothermal energy uses little footprint, unlike solar and wind which both take up a lot of space. Also, in colder climates (like Pacific Northwest), we can learn from Icelanders and use the 'leftover' heat to heat buildings - saving yet more fuel.