Dr. Roberts reviews an article by Kasting, Toon, and Pollack about the importance of the greenhouse effect to the early history of the Earth. Walter Orr Roberts informal series, "Provocations." Each issue consists of provocative comments related to scientific issues that mostly focus on weather, ... Show moreDr. Roberts reviews an article by Kasting, Toon, and Pollack about the importance of the greenhouse effect to the early history of the Earth. Walter Orr Roberts informal series, "Provocations." Each issue consists of provocative comments related to scientific issues that mostly focus on weather, climate, the sun, or near space, with the aim of creating a forum for discussion. Show less
