drought, A long period when there is little or no rain., erosion, Soil being gradually damaged and removed by the waves, rain, or wind., logging, The activity of cutting down trees in order to use their wood., forest fire, A fire burning in an area of land with many trees, that is difficult to control and sometimes spreads quickly., intensive farming, A way of producing large amounts of crops, by using chemicals and machines., contamination, The process of making something dirty or poisonous., mining, The industry or activity of removing substances such as coal or metal from the ground by digging., genetically modified, A plant or animal that has had some of its genes changed scientifically., famine, A situation in which there is not enough food for a great number of people., waste, What is left after useful parts of any material have been removed..

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