1)In fast many of the environmental problems that have received the most public  attention are even worse  than we thought-from destruction of the rain forest to______________________in the Arctic.

2) The main cause of the____________________is the industrial burning of coal and other fossil fuels the waste gases from which contain sulphur and nitrogen oxides which combine  whith atmosphere water to from acids.

3)________________________________is a long-term significant change in the climate of  an area or of  the earth usually seen as a result of human activity.

4)People have been looking for alternative sources of energy in order to avoid global______________________________