Rewrite the sentences in the passive. 1. rainforests regulate the earth`s weather. 2. scientists have investigated only 2 percent of 250.000 known plant species for their possible medicinal value. 3. environmentalists are constantly developing projects to ensure the survival of the ecosistem. 4. governments and elected officials will need to pass tougher environmental laws. 5. the oil explorstion business nearly drove the hawaiian monk seal to extinction. 6. greenpeace was protecting the environment long before it became fashionable. 7. whalers had hunted the blue whale almost to extinction.

1.  The Earth's weather is regulated by rainforests.

2.  Only 2 percent of 250,000 known plant species have been investigated (by scientists) for their possible medicinal value.

3.  Projects to ensure the survival of the ecosystem are constantly being developed by environmentalists.

4.  Tougher environmental laws will need to be passed by governments and elected officials.

5.  The Hawaiian monk seal was nearly driven to extinction by the oil exploration business.

6.  The environment was being protected by Greenpeace long before it became fashionable.

7.  The blue whale had been hunted by whalers almost to extinction.

8. According to some estimates, greenhouse emissions will have been reduced by countries in five years.

9.  A predator had never been faced by the dodo before its natural habitat was invaded by humans.

10. The elephant population is going to be destroyed by illegal hunters.