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3.1.2.2 Tropical rainforests (part b) management Typeit
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Rainforests are under threat from exploitation for a number of reasons. As populations grow, people are moving into the forests to earn a living. People were also given incentives by the government to move in order to reduce crowding in cities. A small scale example would be subsistence farming, using a clearance technique called slash-and-. After a few years of farming, the soil fertility declines and the land is . The residents then have to move onto the next parcel of land. Some people say that this is because the forest regrows afterwards. If you look at aerial photos of rainforests, you may see the classic herringbone pattern, as plots of land are cleared along .
To debt-ridden countries, rainforests offer a chance to pay off those debts - the trees produce valuable timber, crops can be grown on the land, or cows can be grazed on pastures. In Indonesia for example, a type of oil is produced called oil, which reduces the habitat for orangutans. There are other reasons that land is cleared as well - such as for energy developments - oil and fields are located under some rainforests, and can be built in order to produce hydroelectricity. There may also be precious metals and great mineral wealth below the rainforests.
There are catastrophic consequences of deforestation, on both a global and local scale. You've probably heard that rainforests are the 'lungs of the Earth'. They absorb enormous quantities of dioxide and help mitigate against climate change. By burning tropical rainforests, the carbon is released back into the , causing further warming. Rainforests are also home to a lot of species that we don't know exist. It is important to save these species from , if only because they may be found to benefit us - for example they may be able to provide us with medicines.
When you cut down trees, you expose the soil to direct rainfall as there is no . This means that the soil becomes eroded, and the silt is washed into as runoff increases - this is both bad for the land (which also becomes infertile) and the health of the river ecosystems. The local cycle is also affected - rainfall decreases because there is less transpiration. It also becomes warmer locally because of the the reduced , and the sun strongly heats the ground.
To debt-ridden countries, rainforests offer a chance to pay off those debts - the trees produce valuable timber, crops can be grown on the land, or cows can be grazed on pastures. In Indonesia for example, a type of oil is produced called oil, which reduces the habitat for orangutans. There are other reasons that land is cleared as well - such as for energy developments - oil and fields are located under some rainforests, and can be built in order to produce hydroelectricity. There may also be precious metals and great mineral wealth below the rainforests.
There are catastrophic consequences of deforestation, on both a global and local scale. You've probably heard that rainforests are the 'lungs of the Earth'. They absorb enormous quantities of dioxide and help mitigate against climate change. By burning tropical rainforests, the carbon is released back into the , causing further warming. Rainforests are also home to a lot of species that we don't know exist. It is important to save these species from , if only because they may be found to benefit us - for example they may be able to provide us with medicines.
When you cut down trees, you expose the soil to direct rainfall as there is no . This means that the soil becomes eroded, and the silt is washed into as runoff increases - this is both bad for the land (which also becomes infertile) and the health of the river ecosystems. The local cycle is also affected - rainfall decreases because there is less transpiration. It also becomes warmer locally because of the the reduced , and the sun strongly heats the ground.