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1、Unit 1Part I Getting readyA.B. Keys:1: burning of the forests/tree removal (deforestation)/reduction of the worlds rain forests2: global warming/greenhouse effect/emissions of CO2Part II The Earth at risk (I)A. Keys:1.a. More people-more firewood-fewer treesb. More domestic animals-more plants-fewer
2、 available plantsa, b- More desert-move south-desrtt expanding south-no grass2. Growing crops stabilize soil, without them the top soil just blows away. But if there isnt enough rain the crops dont grow.3. People try to grow food to support themselves or to create ranches where cattle can be raised,
3、 or to get hardwood for export, or to make way for an iron ore mineB. Keys:1: Sahara Desert2: North America & most of Europe3: top soil blowing away4: tropical forests destruction5: animal/plant species becoming extinct6: climate change for the whole worldPart III The Earth at risk (II)A. Keys:1: Tr
4、ees would hold rainfall in their roots. When forests in the higher up-river have been destroyed, all the rain that falls in the monsoon season flows straight into the river and starts the flooding.2: He implies that some national governments just consider the results of their policies in the near fu
5、ture, or just think as far ahead as the next election.B. Keys:1: flooding in Bangladesh2: Action to be taken3: population controlPart IV More about the topic: The Effects of Global WarmingKeys:1: Warming up of the world2: Effects of global3: reduced potential for food production4: change of patterns
6、 of hear-related food poisoning, etc.Part V Do you know?A. Keys:1: F 2: F 3: F 4: F 5: TB. Keys:Dos 1: your towels 2: Cut out 3: a wall-fire 4: fridge 5: wait until youve a full load 6: a complete mealDonts 7: iron everything 8: the iron up 9: the kettle 10: to the brim 11: hot foodTape scriptof Uni
7、t 1Part I Getting readyA.B. 1.The Amazon forests are disappearing because of increased burning and tree removal. In September, satellite pictures showed more than 20000 fires burning in the Amazon. Experts say most of these fires were set by farmers. The farmers were attempting to clear land to grow
8、 crops. The World Wildlife Fund says another serious problem is that too many trees in the Amazon rain forest are being cut down. The World Wildlife Fund says the fires show the need for urgent international action to protect the worlds rain forests. The group warns that without such action some for
9、ests could be lost forever.2. Environmental issues swell to the full in Berlin this week, for the UN spongsored conference on global warming and climate change is the first such meeting since the Rio summit three years ago. With scientists and governments now generally ready to accept that the earth
10、 climate is being affected by emissions of CO2 and other greenhouse gases, over a hundred countries are sending delegations. But how much progress has been made implementing the greenhouse gas reduction target agreed on at Rio? Simon Dary reports.Part II The Earth at risk (I)A.I (Interviewer): Brian
11、 Cowles is the producer of a new series of documentaries called The Earth at Risk which can be seen on Channel 4 later this month. Each program deals with a different continent, doesnt it, Brian?B (Brian Cowles): Thats right. We went to America, both North and South and then we went over to Africa a
12、nd South-East Asia.I: And what did you find in each of these continents?B: Starting with Africa, our film shows the impact of the population on the environment. Generally speaking, this has caused the Sahara Desert to expand. Its a bit of a vicious circle we find. People cut down trees for firewood
13、and their domestic animals eat all the available plants and so consequently they have to move south as the Sahara Desert expands further south. I mean, soon the whole of Mali will become a desert. And in East Africa: here the grasslands are supporting too many animals and the result is, of course, t
14、heres no grass nothing for the animals to eat.I: I see. And the next film deals with North America?B: Thats right. In the USA, as you know, intensive agriculture requires a plentiful supply of rain for these crops to grow, I mean if there isnt enough rain the crops dont grow. And growing crops stabi
15、lize soil, without them the top soil just blows away. This is also true for any region that is intensely farmed most of Europe, for example.I: And what did you find in South America?B: In South America (as in Central Africa and Southern Asia) tropical forests are being cut down at an alarming rate. This is done so that people can support themselves by growing food or to create ranches where cattle can be raised to be exported to Europe or America as tinned meat. The problem is that the soil is so poor that only a couple of har
