Authors /Lee A. Vierling Lee A. Vierling studies environmental change and teaches at the University of Idaho. Feature The great exhale: CO2 and the extinction of species Long ago, another atmospheric shift took place. It shows how different the earth's environments have been—and how different they may become. May 23, 2012 Free Newsletters From theological reflections to breaking religion news to the latest books, the Christian Century's newsletters have you covered. Explore Newsletters
