John Roe is a Mathematics professor at Penn State, and a board member of PA IPL (the link on his name will give you a glimpse of his wide-ranging talents and interests). John also keeps a blog called Points of Inflection that is well worth following. This semester he is teaching a course he has been building to for a long time: Math for Sustainability. You can read a news article about the course, or go directly to the course website.
In February, Penn State held a sold out TEDxPSU, which was streamed, and now has finally been released as a set of videos. Sit down with your lunch and enjoy John Roe give his TEDxPSU talk entitled Cool Head, Warm Heart: Math, Love, and Sustainability