On December 11, one of Peru’s most horrific environmental and public-health disasters will command worldwide attention when CNN debuts the first part of “Planet in Peril: Battle Lines” (Thurs., 9 p.m. ET). The show focuses on the Doe Run Peru smelting complex in La Oroya, in central Peru, where sky-high levels of lead and other toxic metals have contaminated the air and water, poisoning area residents. (Nearly every child in the town has lead poisoning.) Doe Run is a St. Louis-based company that is part of Renco Group, a private-holding company of New York businessman Ira Rennert. Doe Run Peru is part of Doe Run. The Doe Run crisis has been the subject…