Over at my sister-in-law Heather Sparks's new Science Sparks Art tumblog, selections from Richard Misrach and Kate Orff's book Petrochemical America, a collection of Misrach's photos and Orff's "ecological atlas" documenting Louisiana's "Chemical Corridor," aka "Cancer Alley." Above, Taft, Louisana's Holy Rosary Cemetery purchased by Dow Chemical. Petrochemical America