California Gov. Jerry Brown, right, shakes hands with former Gov. Arnold Schwarzenegger, left, after signing a climate bill on Treasure Island, Tuesday, July 25, 2017, in San Francisco. Gov. Brown signed legislation keeping alive California's signature initiative to fight global warming, which puts a cap and a price on climate-changing emissions. The Democratic governor was joined by his celebrity predecessor, Arnold Schwarzenegger, who signed the 2006 bill that led to the creation of the nation's only cap and trade system to reduce greenhouse gases in all industries.