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

Write a 2000-3000 essay on agricultural exploitation and human effects on the environment.

Extracts from this document...


Write a 2000-3000 essay on agricultural exploitation and human effects on the environment. Show how human activities have led to instabilities in population. Examples of use: deforestation, over-fishing, pest control, fertilisers. Humans rely on earth's resources for a high quality of life. As the population surge continues, more food has to be produced to meet the high demands of people. However in relying on more and more resources, the population have forgotten to stop and think about the environment. The growth in human population has caused: * More waste is being produced. * More pollution is being caused. * Non-renewable energy resources, such as coal, oil and natural gas, are being used up rapidly. * Raw materials are being used up rapidly. Agricultural production has been rising over the last few decades. Production has been rising due to an increase in the development of various crops and animals, and more intensive methods of farming. New varieties if crops and farm animals have been developed by artificial selection and genetic engineering. Crops can be genetically engineered to be resistant to pests. Many foods now contain genetically modified organisms. Some humans think that these will help food production and maintain high standards of living for the population. However, there are people that believe that we have the ability to produce adequate food without genetically modified organisms. They believe that the genetically modified organisms should be researched into for long term effects on health and environment. Agriculture is becoming more and more mechanised and the conditions can be controlled much more than before. ...read more.


Advantages of chemical control: * Pests are destroyed quickly and fairly cheaply * Chemicals can be applied on a small level * Doesn't need a high level of skill * Very effective means of control Disadvantages of control: * Chemicals aren't specific and can damage non target insects. With the removal of insect predators, there may be a resurgence in the pest * Pesticides contain poisonous chemicals which could enter into food chains likely to then kill birds, fish or mammals. * Pests could become resistant to pesticides. * Chemical residue could harm humans Chlorinated organic chemicals such as DDT were constant and remained in the environment for long periods, which is not what is required of a modern pesticide. However DDT was over used and this led to resistance from many species of insects. The suitable insecticide is an effective pesticide at low quantities and kills harmful insects. Another key point is that it should have no environmental effects. Researcehrs are constantly making progress on developing on new compounds. In the latest generation of insecticides, the pyrethroid has been developed from the flower of the plant named Pyrethrum. However, the effect of the natural pyrethrum was found to be short term as it was quickly broken down by sunlight. Biochemists then used the natural pyrethrum as a beginning point to develop a much safer, stable compound, suitable for insect control in field crops. Farmers should spray their crops in early morning or late evening to avoid harming passing by bees and ladybirds. ...read more.


Agricultural is way of combating deforestation. Possible solutions to problems of deforestation: * Managed forests involving the sustainable replanting and regeneration. * Providing protected areas to preserve species. There have been dramatic increases in the intensity and efficiency of commercial methods. This has meant that over-fishing is happening in many areas of the world. Fish are a renewable source. Over-fishing results in a depletion of younger fish, so that the breeding stock can't maintain previous population levels. If the rate at which they are removed exceeds that at which they have been produced, their supply is disappearing. Fishing isn't examined for possible negative issues. In a fish farm, fish are replaced by artificial breeding. However in the ocean, fish are taken out of the sea from humans with no aim to replace them by breeding. Over fishing often causes both a fall in the number of fish and a change in population structure: young smaller fish may become increasingly common as fishing fleets try to maintain the size of the fish they catch. Catching large numbers of small fish before they spawn can seriously reduce their ability of their species to reproduce. This could lead to a terrible fall in the local population of smaller fish. However fishing is likely to halt due to economic reasons, fishing is likely to stop before it can cause extinction. International agreements have been gained on control like: * Enforcing exclusion zones * Imposing quotas * Restricting the mesh size of nets - bigger nets may allow juvenile fish to escape and reproduce. * Having closed seasons for fishing ...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 Energy, Respiration & the Environment 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 Energy, Respiration & the Environment essays

  1. Marked by a teacher

    Effect of nitrate concentration on the growth of Duckweeds

    5 star(s)

    in the required form such as proteins, coenzymes and other nitrogen containing components, essential for the plant to survive and grow. Since nitrogen is already available inside the plant cells the duckweeds in this concentration are able to carry on growing until nitrogen becomes a limiting factor.

  2. Marked by a teacher

    Investigation on the size of Limpets.

    5 star(s)

    In this experiment, the level of significance is equal to 0.05; the standard value used in biological experiments, and the degrees of freedom is 30. Using the table of T-distribution, see appendix 1, the critical value for this experiment can therefore be shown to be 2.042.

  1. An investigation into the distribution of adult and juvenile limpets on a rocky shoreline.

    B Once I will have found the chi-squared number, I can compare it to a significant table in order to find out how significant the results are and either reject the null hypothesis showing that the abiotic and biotic factors affecting the distribution of limpets or I can accept the

  2. The purpose of this coursework was to investigate the impact visitors have had on ...

    Sample placed in soil bags. Soil sample placed in individual test tube using spatula and barium sulphate and indicator solution added. A soil pH meter would have been convenience wise much easier to achieve the data, however, adding the barium sulphate to the soil samples taken has ensured my data reliability.

  1. Investigating the effects of different lead chloride concentrations on the growth of cress seedlings

    Lead is not an essential component for plant growth however; it can be readily absorbed and accumulated by different parts of the plant. The rate of absorption depends on the conditions of the plant and the surrounding environment. If there is a high concentration of lead in the soil, if

  2. chemistry of renewable resources

    Some of these technologies, like gas from landfills, already provide cheap power but others, like gas from household waste digesters, are only just reaching the market. * All biofuels are safe to handle and store due to their high ignition point * The advantages of biofuels include their contribution in

  1. A Comparative Study of the Density of Patella Vulgata (Common Limpets) in the Optimum ...

    At the Third Tropic Level are many animals that are First-Level Carnivores, capturing and eating other organisms. E.g. predatory molluscs. The Second-Level Carnivores include flesh-eating fish, mollusc-eating birds and humans. Preliminary Work: - Before carrying out the actual investigation, I did some preliminary work on the zonation of plants and

  2. Discuss the Advantages and Disadvantages of being Ectothermic and Endothermic in the Vertebrates.

    One of the most extreme cases of this is the ability of many amphibians and fish to supercool which allows them to survive at temperatures below freezing. Other ectotherms use antifreeze agents in their tissues to lower the freezing point of the water in their cells.

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