“…in individual rooms, sorting of bio-waste, reuse of recycled materials), see for example studies [ 30 , 75 – 82 ], in the area of water conservation (installation of lever faucets and pearl faucets, installation of water-saving shower heads, use of two-stage flushing, rainwater harvesting), as highlighted by studies [ 83 – 90 ]. In addition, several measures are focused on reducing heat consumption (individual room heating and air conditioning controls, building insulation, window insulation) [ 91 , 92 ], energy savings(use of solar energy, energy saving appliances, energy saving and LED light bulbs, central lighting switches in rooms, motion sensors) [ 93 – 97 ], saving of chemicals and products including energy (changing bed linen and towels on demand, using environmentally friendly (eco) cleaning products, minimizing single-use product, preferring products with "eco" label) [ 98 , 99 ]. Other measures include promoting the eco-program to the public, informing guests about environmental efforts [ 74 , 100 , 101 ], educating employees on environmental management and rewarding them for suggestions to improve the environment [ 68 ], and encouraging employees to use public transportation.…”