The burning of some fuels creates carbon dioxide, carbon monoxide, sulphur dioxide, methane and other gases which rise into the atmosphere. What do you call these gases?

Friends of the Earth, Green Peace and other people concerned with protecting the environment are holding a forum in London next month. What do we call these groups?

We should all try to process waste material so that it can be used again. What do you call this process?

More and more cars are being built to use fuel which has been made without lead additives. What do we call this fuel?

Many companies are developing boxes, cartoons, and cans which can be easily decomposed by organisms such as bacteria, or by sunlight, sea, water, etc. What do you call this type of material?

Human beings have had a devastating effect on the living things, both large and small, in many parts of the world. What do you call the community of those large and living small beings?

"Don't drink that water! It's been made dirty by something being added to it!" Another way to say this is that the water is ______.

These potatoes are cultivated naturally, without using any chemical fertilisers or pesticides. What do you call these types of products?

The gases and other substances which come from factories using oil, coal and other fuels which are the remains of plants and animals can cause serious damage to the environment. What do you call this kind of fuel?

This bread is made from wheat which has been altered at a molecular level so as to change certain characteristics which can be inherited. What do we call such products?

Many ecosystems are endangered by animals or plants that do not belong to these regions originally. We shall also say these animals or plants are not _____.

Farmers have cleared hectares of thick wooded land in tropical regions where the precipitation is very high. What do you call these areas?