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Population and resources
Managing natural resources- other examples small and large scale
Small scale schemes- low technology, Treadle pump in Northern India
Pumps water from 7 metres below the surface
Simple and cheap to maintain and no diesel is needed which reduces the cost
of running them and the environmental damage caused by them.
Allows for more irrigation and more crops are produced each year
Allows for children to stay in school as parents don't need to migrate in
search of work.
However, the water table has to be high enough and when it isn't the pump
doesn't work so will be ineffective in places.
Large scale schemes- 3 gorges dam in China
Cost $26 billion to prevent floods and to provide freshwater, tourist
income and hydro electric power.
Supply 10% electricity of Chinas 1.3 billion people
However, the dam displaced over 1 million people many of whom did not get
adequate compensation. Also it only supplies electricity for 130,000 people
which means it does not make a significant impact on china's energy supply.
It also sits on a tectonically active zone which means there is a potential
for a large disaster. Also sedimentation could starve the valley of valuable
sediment downstream; the sediment is a natural barrier to floods and is an
important fertilizer for soils.
Organic farming- minimising environmental damage
Fewer pesticides and fertilisers
However, produce is more expensive and there is a muh lower supply of it.
Hydro phonics- substitution
Large output on small amount of land
Grows quickly without the need to use soil as it only uses water to grow
Fertilisers don't run off into rivers as they are used inside
Highly efficient and therefore cheaper
However, it uses electricity for false lights and is grown artificially with
large inputs of fertilisers and pesticides
Small scale micro grids in Thiba, Kenya
Thiba is a small scattered community in the tea growing region of Kenya. The
people here built their own micro hydro plant with help from NGO's and Kenya's
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Population and resources
rural electrification agency. It uses water from a small river which flows off
Mount Kenya and flows constantly all year round. The water turns a turbine to
generate electricity which is distributed amongst the community. The people in
Thiba manage the scheme themselves. This scheme means that renewable energy can
replace non renewable energy that was often dangerous such as wood that was
burnt in homes and produced smoke that lead to health problems such as lung