This storyoriginally appeared on CityLaband is part of theClimate Deskcollaboration. In a coastal city, it’s easy to assume the greatest climate threat comes from the rising ocean. But in Long Beach, California, the biggest danger is not the sea, but the sun. “We have to deal with sea-level rise,” Long Beach Mayor Robert Garcia said. “But it’s not our biggest challenge. The increase in temperature is the real concern right now.