Sen. Barbara Boxer called for urgent steps to fix the problems of the deteriorating Salton Sea, saying state and federal agencies need to speed up efforts to control dust and protect habitat as California’s largest lake declines. Boxer visited an expanse of dry, dusty lakebed on the south shore Thursday and talked with federal wildlife officials about their plans to build 500 acres of wetlands along the receding shoreline. “The sea is drying up at an alarming rate, and we better deal with it. It is our job,”