Broad Beach has long been a scenic backdrop to Malibu's public access wars. The tranquil rhythm of surf has been routinely shattered by security guards and sheriff's deputies bouncing beachgoers who spread towels on the confusing mosaic of public and private sand.

Today, Broad Beach has shrunk into a narrow sliver of its former self. And like other skinny Malibu icons, its slenderness qualified the beach for a different kind of trend-setting role: How California will deal with rising sea levels.