Part 3 of 4 examines the decline in Energy Return On Investment (EROI) in the world’s biggest oil fields, and the consequences that will have for cilivization. Speakers, in order of appearance, are: Charles A. Hall – Professor, College of Environmental Science and Forestry, SUNY; Micah Melnyk – Canadian Youth Climate Coalition; and Nathan Gagnon – graduate student, SUNY-College of Environmental Science and Forestry.