The Center for International Environmental Law (CIEL) is a not-for-profit environmental law firm that provides a full range of environmental legal services in both international and comparative national law, including: policy research and publication, advice and advocacy, education and training, and institution building.

The Natural Heritage Institute is a non-governmental, non-profit public interest law firm founded in 1989 by a group of experienced conservation lawyers and scientists who foresaw the need for a toolkit for the next era of environmental problem solving.