b． 认读词汇

　renewable, greenhouse, Fahrenheit, Sophie, Armstrong, Janice, Foster, methane,Charles Keeling, measurement, Celsius, famine, destruction, George Hambley, speculation, environmental, hectare, emphasis, individual, appliance, heading, imperative

c． 词组

compare to, come about, quantities of, result in, build up, keep on, on the whole, make a difference, put up with, so long as, and so on

d. 重点词汇

data, quantity, catastrophe, climate, consequence, compare, per, range, glance, average, existence

3. 语法

　"It" used for emphasis

It is human activity that has caused this global warming

4. 重点句子

1). There is no doubt that the earth is becoming warmer. P26

2). Without the greenhouse effect? the earth would be about thirty-three

degrees Celsius cooler than it is. P26

3). They also agree that it is the burning of more and more fossil fuels that has resulted in this increase in carbon dioxide. P26

4). Together, individuals can make a difference. P30

　5). It takes a lot of energy to make things from new materials.... P30

　　【教学重点】

1. Enable the students to express agreement and disagreement.

2. Help the students learn how to debate over the topic "We should do nothing about global warming."

3. Enable the students to know what to do in daily life to reduce the carbon dioxide content in the air.

4. The structure of "It is ... that ...".

5. Teach the students how to master the use of "it" for emphasis.

　【教学难点】

　1. Enable the students to learn how to support their points of view.

　2 .The structure of an essay

A tape recorder and a computer, Multimedia