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The future of water quality in Australia is the focus of this episode. Extensive agricultural development on the continent has resulted in many negative impacts on its supplies of freshwater. Overuse of chemical fertilizers and pesticides, and their accompanying runoff, result in pollution of waterways. Fertilizers in these waters encourage the growth of algae and other plant life, which inhibit the health of fish and other aquatic organisms. Unique Continent - Australian Environmental Studies: Water in Australia examines these effects on the Murray Darling, the largest river system on the continent.