Professor David Battisti delivers the seventh 2014 Our Changing World lecture, entitled Climate change and Global Food Security. This is also a Carnegie Centenary Professorship public lecture. David Battisti is Professor of Atmospheric Sciences and Director of the Joint Institute for Study of the Atmosphere and Ocean at the University of Washington. This lecture explores the likely impact of climate change and volatility on food production and availability in the foreseeable future. Recorded 4 November 2014 at the University of Edinburgh's Appleton Tower.