Sustainability has become one of the more popular hotel industry trends in recent years, as today’s environmentally conscious customers demand choices that are in line with their personal ethics. At the minimum, modern consumers often require that their hotel be as energy efficient as possible. Increasingly, however, consumers are searching for hotels where eco-friendly planning is a core feature. From ecologically friendly construction materials to passive heating or cooling and renewable energy sources, the eco-hotel trend looks set to be with us for a long time. Fortunately, this trend is good for hotels too — eco-friendly initiatives often mean lower running costs in the long term.