Created for Berkeley’s Ecology Center, which Parkinson helped establish, U.S. Steel reflects the artist’s foundational commitment to environmental activism. Across the composition, a densely inhabited green ecosystem gives way to a barren field of animal skeletons, while a litany of corporations, industrial pollutants, and pesticides, including DDT, mercury, and lead, runs beneath the image. The poster transforms ecological destruction into a stark visual indictment, demonstrating how Parkinson placed her art directly in the service of collective political action.