Which of the following is not a greenhouse gas?

(a) Carbon dioxide

(b) Sulphur dioxide

(c) Methane

(d) Nitrogen

Explain the differences between pure air and polluted air.

Explain circumstances leading to acid rain. How does acid rain affect us?

Describe the 'Greenhouse Effect' in your own words.

Prepare a brief speech on global warming. You have to deliver the speech in your class.