In 2001, Linfield College hosted F. Sherwood Rowland, who shared the 1995 Nobel Prize in chemistry with Paul Crutzen and Mario Molina for their discovery of the chemistry underlying depletion of stratospheric ozone. Sherry Rowland told me that I should develop a course aimed at students majoring in areas outside the sciences, teaching them about stratospheric ozone depletion and global warming. I've been teaching that course nearly every year since then.