Alberto Fontana Villamizar06/04/2012June 4, 2012"I call for a worldwide tax on luxury and waste."https://p.dw.com/p/157j0Image: Liliana Caicedo CamachoAdvertisement "I call for a worldwide tax on luxury and waste. We need to invest more in the development of renewable energy." Alberto Fontana Villamizar, Bucaramanga, Colombia Editor: Helen Whittle