• Join over 1.2 million students every month
  • Accelerate your learning by 29%
  • Unlimited access from just £6.99 per month

Human Impact

Extracts from this document...


Human Impact Essay Evaluation Deforestation is an example of a Global Impact. Forests are cleared to meet demands of increasing human population. With modern technology, forests are being cleared at a much faster rate than they can be replaced. There are many reasons why people cut down trees. Some of the reasons are explained below. Many trees have been cut down to make way for urban development. Land has to be cleared for building houses, roads, factories and many more buildings. Land is also cleared for cultivation purposes as land is needed to grow crops. Land is cleared for grazing purposes as large open grasslands have to be provided for grazing by cattle, sheep, horses and other animals. Deforestation also occurs to obtain timber. Timber (wood) is needed for construction and furniture making, paper industry and fuel as firewood. Deforestation occurs to obtain fibers from plants. Plants are useful sources of fibers for the production for making synthetic textiles, e.g. rayon. There are many effects of deforestation for example, soil erosion, flooding, desertification and climatic change. Forests are important in soil stability. ...read more.


Laws that ensure that trees for timber are cut down selectively and at a regulated rate protect the remaining forests worldwide. Young trees and seed trees are not felled. New seedlings are planted to replace those trees that were cut down for timber. The forestry departments look after forest reserves and ensure that forest conservation laws are obeyed. They check the trees regularly and help control insects and diseases that harm them. Scientist in forestry departments carry out research to improve the quality of forest trees and make the forest more productive. These measures that are implemented help to reduce rapid deforestation. These methods also make sure that trees that are cut down, the land is used for good purposes. Air pollution is another example of global impact. Pollution has been a problem to man for many years. It is the process by which harmful substances are added to the environment. As human population increases and as society becomes more industrialized and urbanized, the problem of pollution has become more serious. Many of the products of modern technology are toxic. These toxic wastes find their way into the air and water, threatening lives of organisms in the ecosystem. ...read more.


Iceberg may melt, releasing a lot of water into the oceans. The sea level may rise and many low-lying countries may be flooded or submerged. Chlorofluorocarbons are non-toxic, unreactive chemicals. They are used as aerosol propellants, as cooling agents in refrigerators and air - conditioners and in foam packing. Ozone is a gas that forms a layer over the earth. It absorbs much of the ultraviolet rays from the sunlight. When CFC's are released into the atmosphere from aerosols, etc, they break down the ozone layer, allowing more ultraviolet light to penetrate into the earth. This increases the risk of skin cancer. There are many ways of reducing air pollution. While pollutants from natural causes e.g. from volcanic eruptions cannot be avoided, those from human activities can be prevented or reduced. The following are some ways by which air pollution can be reduced: Use of catalytic converter in cars, less use of cars e.g. having car pools, use filters or scrubbers on chimney to remove sulphur dioxide, use of non- fossil fuels in factories or less use of fossil fuels especially near more densely populated areas, use of alkalis to neutralize acidic waste products from factories before they are released to the environment and use ozone- friendly products to prevent ozone depletion. ...read more.

The above preview is unformatted text

This student written piece of work is one of many that can be found in our AS and A Level Environmental Management section.

Found what you're looking for?

  • Start learning 29% faster today
  • 150,000+ documents available
  • Just £6.99 a month

Not the one? Search for your essay title...
  • Join over 1.2 million students every month
  • Accelerate your learning by 29%
  • Unlimited access from just £6.99 per month

See related essaysSee related essays

Related AS and A Level Environmental Management essays

  1. Marked by a teacher

    The impact of human activities on the environment

    3 star(s)

    Organophosphates have been used to replace the organochlorines, being less persistent. However they are toxic to humans as well as insects. In humans they inhibit the action of acetylchlorine esterase at synapses.

  2. Causes of deforestation.

    There was widespread mercury poisoning, pollution from mine sludge, and the intensive use of herbicides to control the growth of vegetation near power lines and roads. Fish populations and agricultural production was declining. These problems were further compounded by dams.

  1. The Impact of Man on the Environment.

    These dissolve in rain to form nitric acid. The nitric acid when washed down into the grounds reacts with rocks forming nitrates. Nitrogen in primary producer food chains Nitrates formed by lighting, or applied to the soil in fertilisers are absorbed by plant roots.

  2. Discuss the relative importance of deforestation and its impact on the environment.

    There is also another way the trees help regulate the climate. The shade that the canopies of the trees bring decreases the temperature, it cools the land. If the trees are disappearing at alarmingly high rates than the days get much warmer and the nights much colder (7).

  1. Human Impact on the Ecosystem

    Website 1 estimates that by 1988 6% of the Amazon rainforest had been cut down (90,000 square miles) however due to the isolation of fragments of the forest and the increase of the boundaries 16.5% of the forest was actually affected (230,000 square miles).

  2. What are the effects of Deforestation?

    Human activities add about 5.5 billion tons per year of carbon dioxide to the atmosphere. The illustration above shows total amounts of stored carbon in black, and annual carbon fluxes in purple. (Illustration courtesy NASA Earth Science Chemical Composition: As we would expect for extremely weathered soils, the pH of

  1. Tropical rainforests - causes and effects of deforestation, and possible alternatives to current practices.

    (WRM, 72). Tourism is also a cause of rainforest deforestation. While creation of national parks and other tourist facilities are helping to protect many forests, the building of these facilities has forced the resettlement of many indigenous people. (WRM, 74).

  2. Evaluate The Impact Of Deforestation In Indonesia.

    In addition to this, the MEDC is also a buyer of cheap animal feeds grown on the farms that were built where the forest was cleared. It could therefore be said that the MEDC is indirectly contributing to international problems such as global warming and air pollution through their demand for such products.

  • Over 160,000 pieces
    of student written work
  • Annotated by
    experienced teachers
  • Ideas and feedback to
    improve your own work