Up to 1992, the most important problem was water pollution.

Water pollution became a major problem in the 1970s and up to 1987.

Until the early 1980s, industry was a major source of water pollution.

Water pollution can come from a number of different sources.

More than $300 billion has been spent on controlling water pollution since 1972.

The environmental impact of agriculture, especially water pollution, is a major issue in Florida today.

He said the water pollution was being exaggerated for political reasons.

As someone once said about water pollution, we all live downstream.

There are three major areas of water pollution that need to be addressed.

But natural waters with low water pollution can be in a state of the animals is not available.