1. B6U4 Global warming

2. Faced with global warming, what should we do to reduce it? 1.Turn off the electrical appliances if we don’t use them. 2. Put on more clothes instead of turning up the heat. 3. Walk or ride a bike if you can. 4. Buy things made from recycled materials or economical with energy 5. Plant trees. 6. Be an educator

3. Apart from global warming, what environmental problems do you think are serious? Air pollution, water pollution, noise, acid rain, over deforestation, desertification and so on.

4. Find out the topic sentence of each paragraph Para 1: first sentence Para 2: first sentence Para 3: first sentence Para 4: last sentence

5. Answer key for Exercise 2 (P67) First ParagraphPoint of view Litter is a serious environmental problem

6. Second Paragraph First point of the argument; Evidence Cigarette butts are small but are still bad for the environment. 1. Over 1,600 billion cigarettes are smoked each year in China. Many of the butts become litter.

7. Second Paragraph 2. 4.5 trillion butts are littered every year in the world. 3. Butts spoil the beauty of the environment 4. Butts contain toxic chemicals. These get into the water supply. These decrease the quality of the water and endanger living things. 5. Butts take up to 5 years to break down, so the toxic chemicals add up to a great amount.

8. Third Paragraph Second point of the argument Plastic bags are a danger to the environment.

9. Third Paragraph Evidence 1.Plastic bags are made from non-renewable resources. If they are not recycled, these resources are lost to us. 2.In China, 2 billion plastic bags are used every day. Many of these become litter.

10. Third Paragraph 3. Plastic bags last from 20 to 1000 years in the environment. 4. They can travel long distances in the air and water. They are in rivers, parks, beaches and oceans. 5. Plastic bags kill up to one million seabirds, 100,000 sea mammals and countless fish each year worldwide.

11. Third Paragraph 6. After the animal breaks down, the plastic bag becomes free and can kill another animal.

12. Fourth Paragraph Point of view The environment would be less polluted if we cleaned up cigarette butts and plastic bags. The best solution would be not to smoke or use plastic bags at all.

13. Structure of an argumentation: Part 1: Point of view Part 2: Evidence to support your view Part 3: Point of view

14. Writing: 结合以下内容，写一篇英语短文： 1. 垃圾问题是一个严重的环境问题。 2. 其中最严重的是白色污染。 3. 在日常生活中我们随处可见一次 性餐具和塑料袋。 (disposal dishware) 4. 这些垃圾占据了空间并危害我们的健康。 5. 提出你的解决方法。

15. Part 1: Put forward a problem Part2: Analyse the problem Part3: Solve the problem