![]() ![]() Sydney's emissions measured at a similar, albeit lower level, to other natural drowned river valleys in the United States such as the Hudson River, which flows through New York. ![]() Sydney's emissions were found to be significantly less than China's major dammed river, the Yangtze, which is adjacent to megacities including Shanghai. The emissions from Sydney Harbour - including from urban runoff, leaf litter, soil decomposition and sewage overflow - were found to be very low compared to the highly polluted estuaries of Europe and Asia, which can emit up to 76,500 car CO 2 equivalents each year. The research, by the University of Sydney's Marine Studies Institute and the Centre for Coastal Biogeochemistry at Southern Cross University, is the first long term study of such a large and important Southern Hemisphere system referred to as a drowned river valley, which in Sydney spans estuaries from Middle Harbour to Lane Cove and Parramatta. ![]() That is the message of new research that has quantified CO 2 emissions from the Harbour for the first time - found to be 1000 tonnes annually - equivalent to the pollution from about 200 cars. ![]()
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January 2023
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