In his new book, Hollywood’s Dirtiest Secret: The Hidden Environmental Costs of the Movies (Columbia University Press, 2019), Hunter Vaughan offers a new history of the movies from an environmental perspective, noting that both filmmaking and film viewing has an often-hidden impact on the environment. He reviews four blockbusters, "Gone with the Wind," "Singin’ in the Rain," "Twister," and "Avatar" to provide useful examples of the ecological toll of movies. Hunter is the Environmental Media Scholar-in-Residence at the University of Colorado, Boulder.