Write a letter or contact an elected representative:

California State Legislators List of California's State Legislators		US Representatives Contact information for writing to your congressperson
US Senators Local State Senators on the National website

Contact or stay up-to-speed with other government organizations:

SF Environment Government Environmental Division		Golden Gate National Recreation Area One of the largest urban national parks in the world.
SF Gov Board of Supervisors San Francisco Government homepage		SF Department of Public Works Build and maintain many public systems and areas
California Coastal Commission Land and water regulation in coastal areas		San Francisco Police Department Government website
CA Environmental Protection Agency Restore, protect and enhance the environment.