As daylight rose over the parched and jagged Soda Mountains recently, an emaciated-looking bighorn ewe and two gaunt lambs hoofed carefully over volcanic outcroppings as they searched hungrily for increasingly rare clumps of greenery. Chris Clarke, associate director of the National Parks Conservation Assn.’s California Desert Program, at Soda Lake in the Mojave National Preserve along Zzyzx Road near Baker, …
