There was a post on the Daily WTF about the license for WordWeb. The license was seen as joke, it reads:
You may use the program free of charge indefinitely only if
- You take at most 4 flights (2 return flights) in any 12 month period
- AND you do not own or regularly drive an SUV (sports utility vehicle).
The goal of this license is too reduce emissions. A laudable goal but certainly a strange thing to see. And taking random shots at flights and SUV's isn't likely to help except in getting you posted on Daily WTF.
But what if there was a license that tried to enforce some kind of green requirement on users. Of course it would be almost impossible to enforce, regulate and look after, almost like 90% of the open source licenses out there already in fact.
But then you'd need to have some way of measuring how green a person or organisation is. Maybe a little more complex than this. Could it be possible to make software that forces people to change habits? That would really be a wonderful goal.