In this week's edition of "North By Southwest" Nicolas Jackson attends a "Café Scientifique" at Madrid's Casa Encendida cultural centre where Spanish and British experts on sustainability present original ways to save the planet, starting with our cities. What is urban agriculture and how can it make cities sustainable? Are we taking climate change seriously enough? Which cities and countries are pioneering change, and which are not? Can physical exercise make a difference to the environment and not just to our own health? How can the global challenge of climate change be met through local action? With Professor Peter Head of the Ecological Sequestration Trust, José Antonio Duarte of the In-Gente group at the University of Seville and Dr Robin Stott, founder member of the Commission for a Sustainable London. (02/01/13)
