Diana Ürge-Vorsatz: how buildings contribute to climate change

Professor Diana Ürge-Vorsatz is the director of the Centre of Climate Change and Sustainable Energy Policy at the Central European University in Budapest. She is also Vice Chair of the IPCC. She's in New Zealand to speak at the International Conference on Energy and Environment of Residential Buildings. The professor says buildings, both residential and commercial, contribute to climate change through their carbon emissions which are generated through electricity use. She explains how to turn this around through deep retro-fitting.