Cal DeWitt, a leading Christian environmentalist, speaks five times in Wooster and Columbus later this week, sponsored four of those times by parts of our college. He’s a professor with the University of Wisconsin’s Nelson Institute for Environmental Studies, the author of Earth-wise: A Biblical Response to Environmental Issues, and as the elected town chair of Dunn, Wisc., helped develop an innovative, award-winning land use plan. None other than Bill McKibben (The End of Nature) has written, “I have a lot of heroes, but Cal DeWitt is high on the list.”