Mr Schuler, with your help the Emirate of Abu Dhabi is currently planning to build Masdar City, a zero-carbon urban development. How exactly do you go about doing this – what does it involve as regards concept and organisation?The master plan for Masdar City arose from a competition launched in October 2006. The briefing was one of the most ambitious I have seen in my whole career, and judging by later developments, the clients were deadly serious in their intentions.The first job for the planning team was to be absolutely clear about what we understood by zero carbon. Where exactly do you draw the line? In the end we agreed we would strive for zero carbon in the ongoing operation of the city, including water supply, waste disposal and all transport in the urban area.