The Royal Geographical Society (with the Institute of British Geographers) invites applications for its environment and sustainability research grants. These support research projects investigating some of the bigger issues of environmental sustainability, including water and development, energy security and urban migration. Projects must demonstrate the ability to advance geographical knowledge and to have potential impact beyond the academy.
http://www.rgs.org/OurWork/Grants/Research/Environment+and+Sustainability+Research+Grants.htm