The Green Key programme is operated internationally under the management of the Foundation for Environmental Education (FEE) with Head Offices in Copenhagen, Denmark.

FEE has national member organisations in more than 80 countries worldwide. Many of these member organisations administrate the Green Key programme at the national level or are considering starting the implementation of the programme. In countries without a national Green Key office, Green Key International is in charge of administrating Green Key certified sites.

The Green Key certificate is a leading standard of excellence in the field of environmental responsibility and sustainable operation within the tourism industry. This prestigious certificate represents a commitment by businesses that their tourism establishments adhere to the strict criteria stipulated by the Foundation for Environmental Education (FEE).