There's a very good videocoast on sustainable design, called 'design e²' where you'll find concrete cases. It's about global thinking where 'design' is considered as something that can save the word.
Design in a very broad sence, like society design, ecological desing, etc...
You can view all episodes on Youtube and/ or subscribe for free via Istore on Itunes.
Their website: www.design-e2.com