problem 1) Which of the following are important ‘greenhouse’ gases?
oxygen, water vapour, carbon dioxide, nitrogen oxides, ozone, methane, nitrogen

problem 2) Which part of the carbon cycle is responsible for the increasing concentration of carbon dioxide in the atmosphere.

The human impact on the environment (continued)

problem 3) describe briefly why ‘greenhouse’ gases lead to global warming.

problem 4) By how much do we need to cut carbon dioxide emissions in order to halt global warming?

5%, 20%, 60%, 90%

problem 5) In what way do chlorofluorocarbons (CFCs) cause global problems?

problem 6)(a)What do you understand by the term ‘monoculture’?

(b) What is one disadvantage of a monoculture?

problem 7) Which of the following are not covered by the 1956 and 1968 Clean Air Acts?

(a) Sulphur dioxide emission from power stations.

(b) Smoke emission from factories.

(c) Particulate emission from vehicles.

(d) Emission of chlorofluorocarbons from aerosol sprays.

problem 8) State two ways in which sulphur dioxide emissions from coal-fired generating stations could be reduced.

problem 9) Which of the gases listed below can be reduced in vehicle exhausts by

(a) a catalytic converter

(b) a lean burn engine?

carbon dioxide, carbon monoxide, unburned petrol, nitrogen oxide, water vapour, oxygen