LA Times: Jeremy and Fernando Gutierrez descended a staircase to a cove in Laguna Beach for a nighttime lobster dive and almost fell into the ocean. Even in the darkness, the brothers could see what the problem was — the sand at Treasure Island Beach had all but disappeared, leaving a rugged landscape of rock and a sudden drop-off where the staircase once led gently to the strand. “I couldn’t believe it,” said Fernando Gutierrez, 26, of Costa Mesa. “There was no beach and a 20-foot …