Tourism’s carbon footprint is eight times larger than previously thought according to a new report in Nature Climate Change.
Previous estimates only considered the carbon dioxide emitted in air travel, while this study also evaluates other planet-warming gases produced in the construction and maintenance of infrastructure to support tourism such as hotels, airports, food and souvenirs.
All these combined accounted for  greenhouse gas emissions equivalent to 4.5 billion metric tons of Carbon Dioxide, or about 8% of global emissions from 2013.