IUCN – The World Conservation Union
IUCN is a great resource for sustainable development with a global perspective. Of particular interest to me is the IUCN Commission on Ecosystem Management, which works to promote biodiversity and responsible land use.
Quoted: The Union’s mission is to influence, encourage and assist societies throughout the world to conserve the integrity and diversity of nature and to ensure that any use of natural resources is equitable and ecologically sustainable.