Ned COMER; Brenda Comer; Eric Haygood, husband of Brenda Haygood; Brenda Haygood; Larry Hunter, husband of Sandra L. Hunter; Sandra L. Hunter; Mitchell Kisielweski, husband of Johanna Kisielweski; Johanna Kisielweski; Elliott Roumain, husband of Rosemary Roumain; Rosemary Roumain; Judy Olson; David Lain, Plaintiffs-Appellants, v. MURPHY OIL USA; Universal Oil Products (UOP); Shell Oil Company; Exxonmobil Corp.; AES Corp.; Allegheny Energy, Inc.; Alliance Resource Partners LP; Alpha Natural Resources, Inc.; Arch Coal, Inc.; BP America Production Company; BP Products North America, Inc.; Cinergy Corp.; Conocophillips Company; Consol Energy, Inc.; The Dow Chemical Company; Duke Energy Corp.; Eon AG; E.I. Dupont De Nemours & Co.; Entergy Corp.; Firstenergy Corp.; Foundation Coal Holdings, Inc.; FPL Group, Inc.; Honeywell International, Inc.; International Coal Group, Inc.; Massey Energy Co.; Natural Resource Partners LP; Peabody Energy Corp.; Reliant Energy, Inc.; Tennessee Valley Authority; Westmoreland Coal Co.; Xcel Energy, Inc.; Chevron USA, Inc.; The American Petroleum Institute, Defendants-Appellees