Climate activities areas bigger business citizens even figure harm impact industry months more nations part researchers richer scientists souvenirs tourism vacation from the University of Sydney in Australia say activities areas bigger business citizens even figure harm impact industry months more nations part researchers richer scientists souvenirs tourism vacation causes over 8 per cent of greenhouse gasses. They also say that this activities areas bigger business citizens even figure harm impact industry months more nations part researchers richer scientists souvenirs tourism vacation will continue to increase because the tourism activities areas bigger business citizens even figure harm impact industry months more nations part researchers richer scientists souvenirs tourism vacation is growing. Their study looked at the carbon footprint of many different activities areas bigger business citizens even figure harm impact industry months more nations part researchers richer scientists souvenirs tourism vacation of tourism. It studied the CO2 emissions from transport, events, hotels, restaurants and shopping. It activities areas bigger business citizens even figure harm impact industry months more nations part researchers richer scientists souvenirs tourism vacation researched the carbon emissions from producing activities areas bigger business citizens even figure harm impact industry months more nations part researchers richer scientists souvenirs tourism vacation . The researchers spent 18 activities areas bigger business citizens even figure harm impact industry months more nations part researchers richer scientists souvenirs tourism vacation conducting the research. They included the tourist activities areas bigger business citizens even figure harm impact industry months more nations part researchers richer scientists souvenirs tourism vacation of 189 countries. Researcher Dr Arunima Malik said her team analyzed the activities areas bigger business citizens even figure harm impact industry months more nations part researchers richer scientists souvenirs tourism vacation on the environment of over one million businesses involved in tourism. The researchers said domestic travel was a activities areas bigger business citizens even figure harm impact industry months more nations part researchers richer scientists souvenirs tourism vacation cause of CO2 emissions than international or activities areas bigger business citizens even figure harm impact industry months more nations part researchers richer scientists souvenirs tourism vacation travel. Air travel was the largest activities areas bigger business citizens even figure harm impact industry months more nations part researchers richer scientists souvenirs tourism vacation of tourism's footprint. The researchers said flying would continue to increase global emissions as activities areas bigger business citizens even figure harm impact industry months more nations part researchers richer scientists souvenirs tourism vacation people in the world become activities areas bigger business citizens even figure harm impact industry months more nations part researchers richer scientists souvenirs tourism vacation . The countries causing the most harm were the biggest and richest activities areas bigger business citizens even figure harm impact industry months more nations part researchers richer scientists souvenirs tourism vacation . The USA, China, India and Germany had the largest tourism carbon footprints. Their carbon emissions will continue to increase as more of their activities areas bigger business citizens even figure harm impact industry months more nations part researchers richer scientists souvenirs tourism vacation travel. The activities areas bigger business citizens even figure harm impact industry months more nations part researchers richer scientists souvenirs tourism vacation encouraged holiday-makers and travelers to try and reduce their carbon footprint when on activities areas bigger business citizens even figure harm impact industry months more nations part researchers richer scientists souvenirs tourism vacation so their travel causes less activities areas bigger business citizens even figure harm impact industry months more nations part researchers richer scientists souvenirs tourism vacation to the planet.