Deforestation
For thousands of years humans have been deforesting small areas of woodland to build their own houses or grow crops to feed their families. However, in recent years the increase in the human populationAll of the members of a single species that live within a geographical area. and development of industrial machinery has meant that much larger areas have been cleared. This is often by large companies who deforest to provide land for cattle, rice fields and growing crops for biofuelA type of energy source derived from renewable plant and animal materials, eg ethanol (often made from corn in the United States and sugarcane in Brazil), biodiesel (vegetable oils and liquid animal fats) and biogas (methane from animal manure)..
Deforestation destroys the habitatA place where plants, animals and microorganisms live. of the organisms that live there and through this kills individuals of many speciesA type of organism that is the basic unit of classification. Individuals of different species are not able to interbreed successfully.. Scientists estimate that several hundred species of plant, animal and insect are lost each day partly as a result of deforestation. This means that deforestation is causing extinctions and dramatically reducing biodiversity.
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Global example - Sustainable management of the rainforest
Brazil needs to exploit the Amazon's resources to develop, so leaving the rainforest untouched is not an option. However, we still have a lot to learn about the rainforest and its species. For example, many medicines were found in plants that grow in the rainforest before they became commercially available.
Uncontrolled and unchecked exploitation can cause irreversible damage such as loss of biodiverseThe range of animals and plants in a given area., soil erosionWhen earth is washed or blown away., flooding and climate change.
sustainabilityThe ability to keep something going over time without harming people or the environment. use of the rainforest is essential. Sustainable development will meet the needs of Brazil's population without compromising the needs of future generations.
Possible strategies that allow humans to lessen their negative impact on the ecosystem include:
- Agro-forestry - growing trees and crops at the same time. This lets farmers take advantage of shelter from the canopy of trees. It prevents soil erosion, and the crops benefit from the nutrients from the dead organic matter.
- Selective logging - trees are only felled when they reach a particular height. This allows young trees a guaranteed life span and the forest will regain full maturity after around 30 - 50 years.
- Education - ensuring those involved in exploitation and management of the forest understand the consequences behind their actions.
- Afforestation - the opposite of deforestation. If trees are cut down, they are replaced to maintain the canopy.
- Forest reserves - areas protected from exploitation.
- Monitoring - use of satellite technology and photography to check that any activities taking place are legal and follow guidelines for sustainability.
More guides on this topic
- Field investigations - OCR Gateway
- Feeding the human race - OCR Gateway
- Monitoring & maintaining health - communicable diseases - OCR Gateway
- Treating, curing and preventing disease - OCR Gateway
- Cancer and cardiovascular disease - non-communicable - OCR Gateway
- Monitoring and maintaining health - non-communicable - OCR Gateway