Environmental awareness has grown considerably in recent years. Many people have heard of the major environmental issues, such as the greenhouse effect, the ozone hole, and deforestation. But how many people realise that every day they make decisions which will have environmental effects? For example, driving a car probably contributes to global warming, buying a hamburger in a foam container may further expand the ozone hole, and purchasing a teak table could encourage more deforestation in the tropics.