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The first 200 words of this essay...
"The increase in human population to a present day level of over six billion is having an impact on the biosphere that is greater than ever before". The vast amount of impact is greatly due to three major activities including agriculture, industrialization, and urbanisation. Agriculture being one of the major activities contributing to the impact on the biosphere, is the clearing of natural habitat, which most of our ancestors did when they settled in Australia, and consequently without the knowledge of the side effects of clearing forests, cultivating the soil, repeatedly harvesting crops, as well as today's humans who still continue, can lead to dryland salinity and soil erosion, which both accordingly lead to land degradation. Although the seriousness of the agriculture is getting worse, it can be combated.
Humans have been obliterating forests all over the world for reasons like, timber, firewood, settlement and agricultural purposes. The benefit for agriculture is almost pointless because the soil in tropical rainforests is of poor nutrients, although the land often becomes productive after a couple of years after the clearing but when there is a limited supply of nutrients in the soil, which is rapidly used up, the crop just declines.
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