Professor Bruno Latour delivers the Gifford Lecture series entitled "Facing Gaia. A new enquiry into Natural Religion". Lecture 2: A Shift in Agency - with apologies to David Hume Once nature and the natural sciences are fully ''secularized'', it becomes possible to revisit also the category of the supernatural. Then, a different landscape opens which can be navigated through an attention to agencies and their composition. Such a freedom of movement allows the use of the rich anthropological literature to compare the ways different "collectives" manage to assemble and totalize different sets of agencies. Recorded on Tuesday 19 February 2013 at St Cecilia's Hall, the University of Edinburgh.