This storyoriginally appeared on CityLaband is part of theClimate Deskcollaboration. In a coastal city, it\u2019s 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. \u201cWe have to deal with sea-level rise,\u201d Long Beach Mayor Robert Garcia said. \u201cBut it\u2019s not our biggest challenge. The increase in temperature is the real concern right now.