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Fertilisers can cause eutrophication, this is where fertilisers run off hills or steep surfaces when it rains. The fertilisers then run into rivers, where eutrophication takes place, it starts by increasing the amount of phytoplankton in the water, this then blocks out the sunlight, which leads to plants being unable to photosynthesise, which in turn means that the fish and other creatures don't have anything to eat, which means they die and then in turn so do other animals that depend on them such as birds.

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