Mans Influence On The Environment.

Mans Influence On The Environment

The Increase In Population

There is an increase in population; the world’s population is increasing slowly but steadily. It is increasing by 1.7%, 1.2 million, every year. A population is limited by food supply, this happens because population size is determined by food and nutrients available to people and people’s competition to reproduce. This population is increasing because such factors which control or reduce population have been removed:-

The risk of death by disease has been reduced by modern medicine, which causes the population to increase.
Farming techniques have also made more food available for this rise in population.
The birth rate is rising, especially in under-developed countries.
The earth has many resources and demand is high.

Increase In Pollution

The more people we have on the earth the more polluted it gets, the more CO2 breathed out of peoples lungs. Also as it becomes more developed more people dive more cars, and there is more demand on energy sources, more pollution. There are three main man-made sources of atmospheric pollution:-

Fossil fuels such as coal, oil and natural gas are burnt in cars and power stations, sulphur dioxide and oxides of nitrogen. This in turn pollutes the air and contributes to the green house effect.
CFC’s, chloro-fluoro-carbons, are found in aerosols, fridges, air-conditioning ...

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Increase In Pollution

Fossil fuels such as coal, oil and natural gas are burnt in cars and power stations, sulphur dioxide and oxides of nitrogen. This in turn pollutes the air and contributes to the green house effect.
CFC’s, chloro-fluoro-carbons, are found in aerosols, fridges, air-conditioning units and polystyrene. These gases pollute the air and effects of previous use has caused a hole in the ozone layer, which means UV rays can reach the earths surface and irritate people, causing cancer etc.

Food Supply And Farming

Over farming and destruction of land pollute the environment and leaves animals with out homes. Also our production supports the rise in population. Fertilising also causes water pollution. Some of the following farming techniques have a bad influence on the world;-

Removal of hedges removes the natural habitat of wild creatures can cause soil erosion.

Over use or careless us of fertilisers can pollute rivers, then killing fish. The oxide also produced get taken up in vapour and causes acid rain.

Removal of a species from the food chain can effect other organism’s populations.

Intensive farming of animals is described by many as inhume and immoral and can effect the food chain balance.

Deforestation of areas can cause four main problems:- Decrease in rainfall-as less moisture evaporates from trees. Soil erosion-after rainfall as there are no roots to hold it together. Flooding-as soil is washed into rivers and silts them up. Increase in carbon dioxide levels-due to decrease in photosynthesis.

The Green House Effect

Human kind created the green house effect all alone, this creates great problems and self-inflicted wound. This all happened due to:-

The earth’s temperature is affected by the difference between the energy received from the sun and the energy it radiates back.

The earth’s atmosphere thickness is rising slowly, this is called the greenhouse effect.

Methane and carbon dioxide are extremely good at reclaiming heat, and levels of production of these have increased.

This increases the thickness of the layer of green house gases and keeps more heat in.

This greenhouse effect may cause flooding and drought due to changes in weather patterns and climate.

Increase of deforestation has increased the amount of CO2 in the atmosphere, and this is a greenhouse gas and contributes to the greenhouse effect.

Mans Influence On The Environment.