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* By 2100 the population will be 12-15 billion, or seven times its sustainable level. * Farmers are abandoning 25 million acres each year because of soil loss or waterlogging. * The declining fertility of the soil will lower food production by 20% in the next 25 years. * Topsoil is being lost 40 times faster than it can be replaced. * Crop losses destroyed by pests have increased four times in the last 50 years. b It is thought that: Note the use of the passive for introducing an idea. c For one thing: This phrase is linked to The problem is... in the previous sentence. = One reason why it is difficult to feed the world‘s population is that... d suitable for growing crops: Point out the structure: suitable +for + -ing e And this area is becoming smaller day by day. = And this area is becoming smaller every day. f it is being built on = buildings are being built on the land g pests: insects or animals that destroy plants, food, etc. h FAO: The Food and Agricultural Organization of the United Nations was founded in 1945 and has its headquarters in Rome. It has about 160 members. The purpose of the organization is to improve rural conditions, agricultural production and distribution, and to raise nutritional levels. i in storage = while it is being stored (责任编辑：admin) |