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.
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By Susan Scutti for CNN.