14May Global tourism’s carbon footprint is four times bigger than thought, study says Categories: Recommended Reading Tags: business travel, carbon footprint, climate change, Emissions, global tourism, greenhouse effect, greenhouse gases, Recommended Reading, tourism Comments Off on Global tourism’s carbon footprint is four times bigger than thought, study says Credit: “Instant Vacation: 2018’s best travel photos” on cnn.com – In this aerial photo taken on April 1, 2018, a group of children join a learning tour to experience tea-picking in Meitan County of Zunyi, southwest China’s Guizhou Province. (Xinhua/Yang Wenbin) (lmm) Some gases, including carbon dioxide and methane, trap heat in the atmosphere, producing a “greenhouse effect,” and so make the planet warmer. The amount of greenhouse gases released by a particular activity is referred to as its “carbon footprint.” The increasing carbon footprint of global tourism between 2009 and 2013 represents a 3% annual growth in emissions, according to University of Sydney researchers. Their paper was published Monday in the journal Nature Climate Change. Overall, the US tops the carbon footprint ranking, followed by China, Germany and India, Malik and her colleagues estimate. Domestic travel, which includes business travel, makes up a majority of the carbon footprints for each of these countries. Read the full article here. By Susan Scutti for CNN.