11.   These environmental problems associated with traffic in housing areas affect very large numbers of people.

12.   These organizations will host forums to discuss local, national and world environmental problems.

13.   Thus, port officials argue, the city should have picked up the tab for fixing the recently revealed environmental problems.

14.   Water users are making sacrifices to solve their environmental problems.

15.   We have promised to provide new and additional resources to help the developing countries to tackle their environmental problems.

16.   Developed countries bear much of the responsibility for environmental problems.

17.   What do you suggest the readers of Awareness Magazine can do to help the environmental problem?

18.   In central and eastern Europe remedial measures must be taken to clear up environmental problems developed through years of neglect.

19.   These included capital investment by US companies in the Soviet Union and co-operation on space projects, environmental problems and medical research.