Here is a good site for info on deforestation. THe site lists the major causes as:
Logging for Tropical Hardwoods
Fuel Wood and the Paper Industry
Grazing Land
Subsistence Farming
http://www.rain-tree.com/facts.htmTHE DRIVING FORCES OF DESTRUCTION
Commercial logging is the single largest cause of rainforest destruction, both directly and indirectly. Other activities destroying the rainforest, including clearing land for grazing animals and subsistence farming. The simple fact is that people are destroying the Amazon rainforest and the rest of the rainforests of the world because "they can't see the forest for the trees."
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Leading the Threat: Governments
Directly and indirectly, the leading threats to rainforest ecosystems are governments and their unbridled, unplanned, and uncoordinated development of natural resources. The 2000-2001 World Resources Report put out by the United Nations reported that governments worldwide spend $700 billion dollars a year supporting and subsidizing environmentally unsound practices in the use of water, agriculture, energy, and transportation. In the Amazon, rainforest timber exports and large-scale development projects go a long way in servicing national debt in many developing countries, which is why governments and international aid-lending institutions like the World Bank subsidize them. In the tropics, governments own or control nearly 80 percent of tropical forests, so these forests stand or fall according to government policy; and in many countries, government policies lie behind the wastage of forest resources. Besides the tax incentives and credit subsidies that guarantee large profits to private investors who convert forests to pastures and farms, governments allow private concessionaires to log the national forests on terms that induce uneconomic or wasteful uses of the public domain. Massive public expenditures on highways, dams, plantations, and agricultural settlements, too often supported by multilateral development lending, convert or destroy large areas of forest for projects of questionable economic worth.
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