Little documentary about the work of architect William McDonough and chemist Michael Braungart, creators of the concept of "Cradle to Cradle (cradle to cradle). The idea based on the principle of "waste = food", they explain how to design products so that, from its conception, can be converted into raw material for something new after the end of their useful life.

http://www.tu.tv/videos/100-por-100-hecho-de-basura