A chemical ____ may destroy harmful insects, but it

often has undesirable side-effects.

A great deal of ____ is used to increase the yield of

crops. But it then runs off into the water supply and causes other problems.

Your car_____ may look OK, but in fact it is part of the

biggest and fastest growing global source of pollution.

It is important to preserve as many species of plant and animal as we can, to maintain____.

Most of the wildlife of a country like Britain has long been

destroyed. The priority now is the ____ of what

remains.

Conservationists are very suspicious of____crops;

they fear 'genetic pollution' of other species.

А ____ produces totally clean energy. But some people

think they are too big, noisy and ugly.

Oil can only be used once, whereas ____ sources of

energy like wind and the sun go on for ever.

Where there are mountains and rainfall, ____ energy

is often a good option.

The use of_____ batteries, for example in personal

stereos, helps to reduce waste and pollution.

Most fruit and vegetables need to be washed carefully, as they carry pesticide _____ on their skins.

The ____ of energy is very high in the rich, developed

countries.

In many places the destruction of forest has lead to serious ___of the soil, and sometimes to flooding.

The ___of the world's natural resources has to be

carefully managed.

Climate is a ____ a certain place has over a long period of time.

Climate has a very important ____ on plants, animals

and humans and is different in different parts of the world.

Scientists think that the reason is _____ effect.

This greenhouse effect is caused by ___ .

Carbon dioxide is produced when we ___ things.

_____ means that there are fewer trees and more carbon dioxide.

The greenhouse gas in the atmosphere works like ___ in a greenhouse.

The greenhouse gas lets ____ get in, but it doesn’t let much ___ get out. 

Greenhouse effect is sometimes called global ___.

What is the term used for the process where poisons used on one species can enter the food chain and affect other species?