Environmental protection wasn’t always so politically divisive.

Former Gov. Ronald Reagan established the California Air Resources Board, which regulates air pollution, in 1967.

President Richard Nixon signed the federal Clean Air Act into law in 1970 and was instrumental in establishing the Environmental Protection Agency (EPA).

Gov. Arnold Schwarzenegger helped California become a leader in rooftop solar by signing the Million Solar Roofs Initiative into law in 2006. That same year, Schwarzenegger also signed into law California’s landmark Global Warming Solutions Act.