1.   Cleaning up polluted rivers will take considerable time and effort.

2.   In the case of a polluted river, the remedy lies in the hands of a national government.

3.   It says that the company razed forests, polluted rivers, retarded crop growth and caused birth defects.

4.   The Dutch authorities have banned polluted river water being brought over from Britain.

5.   Greenpeace has described the Humber as the most polluted river in Britain and a substantial contributor to North Sea pollution.

6.   At least four people have complained of illness after eating fish from the polluted river.

7.   But the landscape of Central Asia is littered with ghost towns and polluted rivers and towns that belie the benign image.

8.   Children bathe in polluted rivers.

9.   Farm-raised fish can provide an alternative to fishing from polluted urban rivers.