
People are silhouetted as they make their way up a beach access stairway to the cliffs at the California central coast seaside resort community of Shell Beach, California, USA, 09 March 2011. The central coast of California which lies between San Francisco and Los Angeles is a popular vacation area as well as retirement community for Americans. EPA/MIKE NELSON

A young man stands on a rock off of the beach at the California central coast seaside resort community of Shell Beach, California, USA, 09 March 2011. The central coast of California which lies between San Francisco and Los Angeles is a popular vacation area as well as retirement community for Americans. EPA/MIKE NELSON

A bee pollinates a flower as it collects nectar from the plant at the California central coast seaside resort community of Shell Beach, California, USA, 09 March 2011. The central coast of California which lies between San Francisco and Los Angeles is a popular vacation area as well as retirement community for Americans. EPA/MIKE NELSON

Two girls walk along the beach at sunset at the California central coast seaside resort community of Shell Beach, California, USA, 09 March 2011. The central coast of California which lies between San Francisco and Los Angeles is a popular vacation area as well as retirement community for Americans. EPA/MIKE NELSON

A boy walks along the beach next to a huge retaining wall at the California central coast seaside resort community of Shell Beach, California, USA, 09 March 2011. Many residential homes perched on cliffs are threatened as erosion from rain and the ocean weaken the cliffs. The central coast of California which lies between San Francisco and Los Angeles is a popular vacation area as well as retirement community for Americans. EPA/MIKE NELSON

A bee pollinates a flower as it collects nectar from the plant at the California central coast seaside resort community of Shell Beach, California, USA, 09 March 2011. The central coast of California which lies between San Francisco and Los Angeles is a popular vacation area as well as retirement community for Americans. EPA/MIKE NELSON

Seagulls nest on a cliff at the California central coast seaside resort community of Shell Beach, California, USA, 09 March 2011. The central coast of California which lies between San Francisco and Los Angeles is a popular vacation area as well as retirement community for Americans. EPA/MIKE NELSON