1.Get students to know about global warming and its effect£»to realize what we can do about global warming.

2£®Have students learn some useful new words and expressions about global warming and let them learn effective ways to master them.

3£®Enable students to grasp and use the expressions of agreement and disagreement£¬blame and complaint.

4£®Let students learn the new grammar item£ºthe use of “it”(2)£®