III. Choose the correct words in the bracket to complete the sentences.

1. Scientists have tried to assess the impact of human activities on the ______ environment ______.

2. We should have ____ forestation ____ plans to replace the trees cut down for farmland use in the region.

3. Oceanic oil spills become a major ____ environmental _____ problem, chiefly a result of intensified petroleum exploitation.

4. The rhino habitat has been perfectly _____ preserved _____ in the region.

5. The students are somewhat ____ confused ___ by the usage of the words “preservation” and “conservation”.

6. Many climatologists believe that the decline in mountain glaciers is one of the first observation signs of _____global____ warming.

7. Rising sea levels can add to the _____ erosion _______ of our coastlines.

8. Waste water has polluted seas and lakes surrounding tourist ____ attraction _____, damaging the flora and fauna.