The Hotel Association of Canada's (HAC) Green Key Eco-Rating Program is a graduated rating system designed to recognize hotels, motels, and resorts that are committed to improving their fiscal and environmental performance.

Based on the results of a comprehensive environmental audit, hoteliers are awarded a 1-5 Green Key rating and given guidance on how to "unlock" opportunities to reduce operating costs and environmental impacts through reduced utility consumption, employee training, and supply chain management.