For decades, environmentalists have rhapsodized about the tranquil beauty of California’s deserts while battling fiercely with energy companies, the government and within their own ranks over what if any power production should occur on those sun-baked, wind-blown, geothermally active expanses of land. On Wednesday, U.S. Interior Department officials signed a blueprint that they touted as a finely tuned effort to balance conservation of California’s iconic desert landscapes with the state’s growing hunger for clean energy in the age of climate change.