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Global tourism accounts for 8% of total worldwide greenhouse gas emissions, four times more than previously believed, new research says. 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. [Source: CNN]
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