Housing developers and conservation advocates clashed over a bill Thursday that would encourage the federal government to open thousands of acres of public land in Clark County for development, a move critics say will encourage sprawl and supporters argue would lower housing costs. … The resolution’s opponents cited concerns about water scarcity, utility costs, urban sprawl, and the urban heat island effect. … A joint study by Clark County and the City of Henderson found that development under the Clark County Lands Bill could increase daily water demand by 49 million gallons, or about 18% of Nevada’s total allocation from the Colorado River.