Formerly the Institute of Terrestrial Ecology and the Institute of Freshwater Ecology - conducts research on air pollution, climate change, and sustainable land use in the tropics. The Centre for Ecology and Hydrology, Bush Estate, Penicuik, Midlothian, Scotland EH26 0QB, UK; Tel: +44-0131-445-4343; Fax: +44-0131-445-3943; Email: edinburgh@ceh.ac.uk.