21. Human Influences on Ecosystems

21.4) Conservation

21.4) Conservation   Sustainable resource: is one that is produced as rapidly as it is removed from the environment so that it does not run out. Sustainable development: is development providing for the needs of an increasing human population without harming the...

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21.3) Pollution

21.3) Pollution   Sources and effect of pollution of land and water. Insecticides: eg DDT controls spread of malaria by killing mosquitos which carry the protoctist parasites that cause the disease. Remains in the environment after it has been sprayed and can be...

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21.2) Habitat destruction

21.2) Habitat destruction   Removal of habitats: Farmland is not natural habitat but, at one times, hedgerow, hay meadows and stubble fields were important habitats for plants and animals. Intensive agriculture has destroyed many of these habitats; hedges have...

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21.1) Food supply

21.1) Food supply   Modern technology has resulted in increased food production: Agricultural machinery is used to clear the land, prepare the soil and plant, maintain and harvest crops to improve efficiency. Chemical fertilisers are used to provide minerals to...

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