Time's Up! is a memoir by the novelist Robert Cabot, whose first book, The Joshua Tree (1970), was one of the earliest of American eco-fictions. This memoir covers the first 75 years of his long life, coinciding with the decades of America's emergence as a world power from the 1920s to the end of the twentieth century. Cabot alternates chapters of his life (including extensive service in World War Two) with chapters about changes in America, including the counter culture of the '60s and the rise of consumerism.