It is likely that this flag is never used without the words FEE on some location on the flag. This may therefore be an archivexillum ("template design") of the Green Flag.
The Eco Schools campaign originated in Denmark in the early 1990s. The idea of making school children environmentally aware was later taken over and developed by the DanishFriluftsradet and the campaign spread to other European countries. The flag and logotype was developed by a French design firm. The flag is an award given to those schools that achieve certain goals in relation to protecting the environment. In other words, it is a companion of the Blue flag of clean beaches.
The Green Flag is awared to Eco-Schools as a mark of high achievement in environmental education and performance as part of the Eco-Schools Programme lead by FEE, Foundation for Environmental Education. Until 2001 the organization was called FEEE - Foundation for Environmental Education in Europe, but since now there are non-European members, the name was changed. FEE also awards the Blue Flag for beaches and marinas (presumably now they are also inscribed FEE instead of FEEE). Unlike the Blue Flag that is awarded for particular year and one which the year is inscribed in canton, the Green Flag apparently have no year on the flag itself (maybe because schools typically have less money to change flag every year then the marinas).
Eco-schools is a programme of FEE, Foundation for Environmental
Education, which Secretariat is hosted by the Danish Outdoor Council. The Green Flag and Eco-schools symbols are copyright and owned by FEE.
Eco-Schools is a programme for environmental management and certification, designed to implement sustainable development education in schools by encouraging children and youth to take an active role in how their school can be run for the benefit of the environment. Eco-Schools is one of the programmes of the Foundation for Environmental Education (FEE - www.fee-international.org) and, as such, it is implemented through FEE Member organizations (one per country). Currently, the Programme is being implemented by 46 delegations in 43 countries around the world, involving 27,000 schools, 6,000,000 students, 400,000 teachers and 4,000 local authorities.