JAMES LAWRENCE POWELL – Humans have already emitted enough CO2 to ensure that global warming will not end in the lifetime of any person reading this essay. As the years and decades go by and its effects become ever more dire, global warming will grow into a perennial campus issue. It is not going away. Some colleges will take the lead and divest now; others will follow eventually. The question for each college is whether, on the most important issue of this century, it will be a leader or a follower.