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The Earth's Resources (Finite and Renewable Resources (We rely on the…
The Earth's Resources
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Water Safe to Drink
Water is made fit to drink by passing it through filter beds to remove solids and adding chlorienm ozone or passing ultraviolet light through it to reduce microorganisms
water can ber purified by distirllation by this requires large amounts of energy which makes it expensive
Reverse osmosis uses membranes to separate dissolved salts from salty water, but this method of desalination also needs large amounts of energy to create the high pressures needed.
Treating Waste Water
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The stages include screening to remove large solids and grit. sedimentation to produce sweage sludge and aerobic biological treatment of the safe effluent released into the environement
The sewage sludge is separated broken down by anaerobic ddigerstion and dried, It can provide us with fertiliser and a source of renewable energy
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Life Cycle Assessments
Life cycle assessments are carreied out to assess the environmental ipnact of products, processes or services.
They analyse each of the stages of a life cycle from extracing and processing raw materai lto disposla at the end of its usefyl life, including all transport and distribution.
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However assigning numerical values to the realative effecxts of pollutants involes subjective judgements, so LCAs using this approuch my make this uncertainty clear.
Reduce, Reuse, Recycle
There are social, economic and environmental issues associated with exploting the Earth's limited supplies of raw materials such as metal ores
Recycling metals saves energy and our limited, finite metal ores and fossil fuels. The pollution cause by the minng and extraction of the metals is also reduced by recycling.