Lori Gruen, professor and chair of philosophy, writes in Al Jazeera about the announcement this month by Ringling Bros. and Barnum & Bailey that it would phase out the use of elephants in circus shows by 2018 in response to a "mood shift among our consumers." Gruen explores how this public change in attitudes came to be. She credits, in part, "the tireless animal activists who appear regularly, rain or shine, to protest when the circus comes to town." These activists highlight the cruel and unhealthy living conditions imposed upon the elephants, such as having their legs chained, lacking adequate exercise, and withstanding…