Tim Nicholson of the Campaign for Greener Healthcare talks about the aims of the 10:10 Campaign conducted by organisations volunteering to reduce carbon emissions by at least 10 per cent in a 12 month period; Fiona Godlee Editor in Chief of the British Medical Journal discusses her publication's involvement with raising awareness of climate change issues over the years and how they've achieved success so far as a 10:10 Campaign member;Paul Wilkinson of the London School of Hygiene & Tropical Medicine discusses the practical ways in which the School is rising to the challenge of meeting the first 12-month target and then going on to cut emissions in half by the year 2020 and 90% by 2040.