Eco-warrior Prince Harry will fly from Canada to the United Kingdom for the first time since renouncing his royal responsibilities to promote a project aimed at reducing the carbon footprint of frequent fliers. The Duke of Sussex will head to Edinburgh on Wednesday to host a conference for Travalyst, an online scoring system that will rank flights, hotel accommodations and tourist attractions by how climate-friendly they are. Travalyst was launched in September of last year, in partnership with leading travel brands including Booking.com, Visa, Tripadvisor, and Chinese owned sites Trip.com and Skyscanner.