(Al Hartmann | Tribune file photo) Photographer Jonathan Bailey passes by Fremont petroglyphs of three figures high in the sandstone caprock in the Molen Reef area of Utah’s San Rafael Swell. The Bureau of Land Management intends to offer a series of oil and gas leases on public lands in the region, which some say could threaten parts of Molen Reef. A new study, meanwhile, concludes that leaving oil, gas and coal resources on U.S. public lands undeveloped could have a substantial effect on reducing gas emissions that contribute to climate change.