Mans Effect On The Environment Essay

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Man’s Effect on the Environment


Freshwater Environments : Man pollutes freshwater all over the world in many ways there is much waste and pollution that ends up in rivers.
One of the main hazards is called eutrophication, this process becomes enriched with artificial nutrients from fertilisers which run off into the rivers and upset the natural nutrient cycle of the river, lake or pond. The water turns green because of the algae which when they die multifly using up all the oxygen.
     Similar consequences occur if raw sewage is pumped into a river.
Chemical waste from factories dump their un wanted waste into rivers, lakes or ponds as well. One major component that effects the water
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At this point the oil can seriously damage the beach and it’s wildlife eg fish.
     The detergents that have been invented sometimes cause more damage than the oil itself but nowadays they use less destructive.


     Lead is found in cars exhausts and some plants.
     It can cause brain damage and various mental disabilities.
     Lead free petrol are now used world wide.


     Eutrophication from fertilisers running off the fields and into rivers and lakes causes abnormal plant growth.
     It causes bad tatse, odours and algae and other things like precipitation of calcium carbonate.
     Treatment in aerobic or anaerobic lagoons can control it.

Kris Charik R10D

Nitrous Oxides

     This comes from factories which burn fossil fuels and from car emissions as well.
     When reacted with sunlight, mosture and oxidants it produces sulphuric and nitric acids. These then get mixed up with the water cycle and fall to earth as Acid Rain.
     Catalytic Converters are used in cars now to reduce the amount of harmful emissions given off. You can also use cleaner power such as Hydro and Nuclear which would also reduce the amount of harmful