Every designer and cyclist should watch Me and My Moulton
It's only vaguely TreeHugger but it is all about design and about bikes and Scandinavian bike culture, so it fits, right? It is also the greatest sendup ever of designers families. My wife and daughter, who had to put up with me, fell of their chairs laughing.
Sorry to Canadians who want to watch, Sorry to everyone, you can only see the trailer and you are supposed to buy it. (I did and it was worth it)
It was up for an Academy award but lost to Disney's Feast. However it comes out of Canada's National Film Board, which has been nominated 73 times and won 12 Oscars, so it is part of a long tradition.
Here is another one that is short and fun.