Professor Ian Bryden, Chair in Renewable Energy, presents "Sustainable Technology: Meeting Our Future Needs and Aspirations". This talk will cover what is meant by sustainable engineering, including what is meant by engineering itself. Professor Bryden will introduce some of the tools used to assess sustainability and then considered the increasingly difficult issues associated with long term development. This lecture is part of the University's "Our Changing World" public lecture series, which examines the global challenges facing society, and the role of academia in meeting these challenges. This lecture was recorded on 1 October 2013 at the University of Edinburgh's Appleton Tower.