When water comes in contact with urban surfaces such as roofs, roads and footpaths, it becomes contaminated with oil, metals, litter and other pollutants.” (Urbanisation and the water cycle, City of Melbourne). Pollutants from this stormwater are carried directly into waterways, bays and oceans. This changes the enviroment and disturbs the breeding cycle for aquatic animals, erodes stream banks, increases turbidity and pollution levels, and alters natural flood cycles. Over the past 50 years, more than a quarter of the world's mangroves have been lost, with urban expansion being a significant driver. Natural structures such as seagrass beds, tidal flats and rocky shores are being rebuilt with artificial structures such as seawalls, piers and pontoons. This affects ecosystems by causing the loss of important populations of organisms. Artificial relationships are less likely to work well with the natural habitats, making them poor substitutes for natural structures. Urbanisation has also found small businesses such as fisheries struggling as they’re not able to compete with the larger industrial fishing operations with better equipment and possibly better methods. It also brings more demand for fish, as more restaurants and buildings are being built and needing them. Us as a human population are all to blame for this. With the population only going up, demand for more housing and more areas is at an all time high. The housing crisis is a prime example of this. The carelessness of our population has lead to this problem. When these areas were designed, enviromental impact was not on the mind. This leads to increased pollution and habitat destruction