One midwestern college has made a radical commitment to “green.” All the paper towels in the lavatories are from recycled materials. Campus police drive hybrids. Prairie grasses have been planted to cut down on mowing. There’s hormone-free milk and local fruit in the cafeteria. Is this Oberlin College, a small, lefty liberal-arts school? No, it’s Wheaton College, alma mater of the evangelist Billy Graham, a school whose motto is “For Christ and His Kingdom.”