2. Although we are burning coal in huge _________ every year, we won't ________ of it for centuries.

3. If the amount of greenhouse gases continues to _______ we could be facing a global __________.

4. Many scientists believe that global warming has __________ through the burning of fossil fuels. They do not think that ignoring the issue is worth the ____.

5. ______ describes weather conditions over a period of years in a particular place.

6. The _____________ of a rising sea level would be widespread flooding.

7. The use of energy in Susanna's country is low ______________ the use of energy in the USA.

8. The warming of the earth is a _____________ that causes great concern.

9. The ________ shows temperature changes during the 20th century.

10. One hectare of forest can absorb 23 tons of carbon dioxide ____ year.

Keys：1.data kept on 2. quantities; run out 3. build up; catastrophe