EnviroTrack Card is a room card and APP that can record the carbon footprint of a hotel stay. Through the electronic paper room card, APP and sensing device, guests can know the carbon footprint consumed when picking up hotel supplies, using water and electricity in the room, enjoying meals or facilities, thereby allowing guests to voluntarily reduce carbon emissions. The platform has a carbon coin system. The accumulated carbon coins can be exchanged for hotel discounts, dining discounts or upgraded services, and can be linked to bank credit card points accumulation, encouraging guests to create sustainable tourism and also reducing operating costs for hotels and increasing occupancy rates.