The Bay Foundation is most well-known for their work on restoring kelp forests, which is signature project of SeaTrees. However they are also helping to restore abalone, which are nearly extinct in the wild. Their innovative work has recently gained media attention in the LA Times.
You can help too by purchasing 'An Ocean Garden' - every sale of this book allows The Bay Foundation to restore one square-meter of kelp forest.
Read the LA Times article on restoring abalone.