Saturday 17 December 2011

Amazon rainforest

http://upload.wikimedia.org/wikipedia/commons/4/4b/Amazon_Manaus_forest.jpgAmazon rainforest

This basin encompasses seven million square kilometers -1.7 billion acres, of which five and a half million square kilometers -1.4 billion acres- are covered by the rain forest. This region includes territory belonging to nine nations. The majority of the forest is contained within Brazil, with 60% of the rain forest, followed by Peru with 13%, and with minor amounts in Colombia, Venezuela, Ecuador, Bolivia, Guyana, Suriname and France. States or departments in four nations bear the name Amazonas after it. The Amazon represents over half of the planet's remaining rain forests, and it comprises the largest and most species-rich tract of tropical rain forest in the world.

is the conversion of forested areas to non-forested areas. The main sources of deforestation in the Amazon are human settlement and development of the land. Prior to the early 1960s, access to the forest's interior was highly restricted, and the forest remained basically intact.Farms established during the 1960s were based on crop cultivation and the slash and burn method. However, the colonists were unable to manage their fields and the crops because of the loss of soil fertility and weed invasion. The soils in the Amazon are productive for just a short period of time, so farmers are constantly moving to new areas and clearing more land.These farming practices led to deforestation and caused extensive environmental damage.Deforestation is considerable, and areas cleared of forest are visible to the naked eye from outer space.

Between 1991 and 2000, the total area of forest lost in the Amazon rose from 415,000 to 587,000 square kilometers (160,000 to 227,000 sq mi), with most of the lost forest becoming pasture for cattle. Seventy percent of formerly forested land in the Amazon, and 91% of land deforested since 1970, is used for livestock pasture. In addition, Brazil is currently the second-largest global producer of soybeans after the United States.

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