Royal Society Discussion Meeting: Trace Gas Monday 13 to Tuesday 14 November 2006 Discussion Meeting held at the Royal Society By Professor David Beerling, Professor CN Hewitt, Professor John Pyle FRS and Professor John Raven FRS Greenhouse gases other than CO2, especially methane and ozone, strongly respond to and influence natural and anthropogenic global change. This meeting will discuss current challenges in understanding the biological and physical processes involved in the formation of trace greenhouse gases, the feedbacks they exert on the global climate system, and analyse their contributions to past and possible future warm climates. 14 November 2006