Colorado’s coal industry is on fire lately, going after natural gas producers with gusto in the wake of last year’s controversial Clean Air, Clean Jobs Act , which requires Xcel Energy to convert several coal-fired power plants on Colorado’s Front Range over to natural gas or alternative fuel sources such as wind and solar. Gas is touted as burning up to 50 percent cleaner then coal and dramatically reducing carbon dioxide emissions as well as the amount of nitrogen oxide, sulfur dioxide and mercury spewing into Colorado’s air.