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Climate scientists from the University of Sydney in Australia tourism over 8 per cent of greenhouse gasses. They also say that this figure will to increase because the tourism industry is . Their study looked at the carbon footprint of many different areas of tourism. It the CO2 emissions from transport, events, hotels, restaurants and shopping. It even the carbon emissions from producing souvenirs. The researchers 18 months conducting the research. They the tourist activities of 189 countries. Researcher Dr Arunima Malik said her team the impact on the environment of over one million businesses in tourism.

The researchers said domestic travel a bigger cause of CO2 emissions than international or business travel. Air travel was the largest part of tourism's footprint. The researchers said flying would to increase global emissions as more people in the world richer. The countries the most harm were the biggest and richest nations. The USA, China, India and Germany the largest tourism carbon footprints. Their carbon emissions will to as more of their citizens . The researchers holiday-makers and travelers to try and their carbon footprint when on vacation so their travel causes less harm to the planet.