Every one to two years, the Green Key National Operators from all around the world gather to exchange best practices, discuss latest trends in tourism ecolabels and build a strategy to involve more tourism establishments in sustainability. Green Key is a voluntary ecolabel for hotels, hostels, campsites, holiday parks, small accommodations as well as conference centres, attractions and restaurants. The Green Key award is based on compliance with strict criteria in the areas of environmental management (water, energy, waste, cleaning, etc.) and sustainability education (staff, guests, suppliers, etc.). Compliance with the criteria is confirmed through a rigorous application process and verified at on-site audits. The award is valid for one year at a time. Currently, more than 2,900 establishments in 57 countries are Green Key awarded. The programme is managed by the international charity, the Foundation for Environmental Education. Green Key is endorsed by the World Tourism Organization and its hotel criteria are recognised by Global Sustainable Tourism Council.