WTO: FEE is member of the World Tourism Organisation, WTO. WTO supports the Green Key campaign actively. WTO has formulated a list of requirements that eco-labels on tourism should fulfil. The Green Key is in compliance with these requirements.
   
HOTREC: Hotels, Restaurants, and Cafes in Europe supports eco-labels that have been established in co-operation with the industry. HOTREC has explicitly recognised the Green Key to be such a label.