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Increases in population size leads to an increase in deforestation, pollution and the loss of habitats which all make higher demands on the earth's resources. Wildlife and

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The human population is increasing rapidly due to improvements in agriculture, living conditions and medicines like antibiotics/immunisations. Increases in population size leads to an increase in deforestation, pollution and the loss of habitats which all make higher demands on the earth's resources. Wildlife and their habitats are harmed because of the greenhouse gases released such as carbon dioxide, methane, cfc's and nitrogen oxide. All these gases contribute to the greenhouse effect, acid rain and pollution in the air, soil and water. As the air is polluted through the burning of fossil fuels they release carbon dioxide, sulphur dioxide and nitrogen oxides which make acid rain. Acid rain harms plants and animals are affected in the rivers and lakes. The rain washes ions, such as magnesium and calcium, out of the soil depleting the minerials available to plants. It also washes aluminium, which is poisonous to fish, out of the soil and into rivers and lakes. This can cause fish to die which would effect the food chain as there would be less fish for other animals to feed on. ...read more.


Many animals are not able to adapt to these rapid changes and they are dying off at an incredible rate. Approximately one hundred species per day are going extinct due to deforestation. These animals need trees/vegetation to survive. Despite its diminished state, the Atlantic Forest harbors around 2,200 species of birds, mammals, reptiles and amphibians - 5% of the vertebrates on Earth. This includes nearly 200 bird species found nowhere else, and 60% of all of Brazil's threatened animal species call this forest home. Some of the Forest's species include the golden lion tamarin, wooly spider monkey, red-tailed parrot, and maned three-toed sloth. The Forest is also home to around 20,000 species of plants, representing 8% of the Earth's plants. In fact, in the 1990s researchers from the New York Botanical Garden counted 458 tree species in 2.5 acres - more than double the number of tree species in the entire U.S. eastern seaboard. New species of flora and fauna continue to be discovered. The forest structure contains multiple plants that help with cures for diseases. ...read more.


Nitrogen gas cannot be used by plants and is converted to nitrates. Nitrifying bacteria in the roots of plants convert ammonia from the decayed remains and waste of animals and plants into nitrates and converts this into proteins. There is no easy solution as deforestation is caused by many things. One option is decreasing the amount of products that are harvested from the rainforests. This could be done by enforcing programs that used recycling, the need for disposable products wouldn't be there so nobody would need to cut the trees down. The less packaging on products would help. Another way would be to plant more trees but the old forests would still be lost and they're not the same as new ones. The use of unleaded petrol and sharing of cars would reduce the amount of carbon dioxide released back into the atmosphere as well. Forests were put on Earth for a reason, as they help to maintain a balance between all of nature's elements and this is being put at risk. BOOKS: Collins,(2005)GCSEBiology.London:Jackie Clegg and Mike Smith Letts,(2001)GCSEBiology.London:Hannah Kingston Roberts, M.B.V.(1986)Biology for Life.2nd ed. China: Thomas Nelson INTERNET: http://www.botany.uwc.ac.za/Envfacts/facts/deforestation.htm(accessed 1December 2005) http://www.enn.com/(accessed 29 November 2005) http://www.nationalgeographic.com/eye/deforestation/effect.html(accessed 29 November 2005) http://en.wikipedia.org/wiki/Main_Page (accessed 1 and 7 December 2005) ...read more.

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