Crowds of tourists, scurrying from one end of the world to another, also damage the environment. Australian scientists concluded that this harm is four times greater than previously thought. 8% of greenhouse gases are released into the atmosphere because of tourism, reports New Scientist .
Scientists have estimated the annual greenhouse gas emissions associated with tourism in 160 countries on the planet. Every year, the industry generates 4.5 gigatons of carbon dioxide equivalent. Previous estimates varied from one to two gigatons.
Australian scientists took into account both direct air transport emissions and indirect sources of pollution: food production for tourists, the maintenance and operation of hotels, the production of souvenirs, and so on.
It is expected that by 2025 these emissions will reach 6.5 gigatons.