The same number of people rely on rice as their staple food, a crop grown largely in natural and artificial wetlands.

The farm uses modern water treatment and is building artificial wetlands.

This is used in artificial constructed wetlands, for treating sewage.

This has led to several successful pilot projects in which artificial wetlands removed the chemical from water that had flowed under military firing ranges.

She said one project involved creating artificial wetlands to cleanse storm-water runoff.

Instead, engineers designed and built a two- to three-acre artificial wetland, complete with cattails.

Because of this, a large area at the foot of the dam was converted into an artificial wetland.

In 2001, the school built an artificial wetland for waste water management.

The latest plan proposes engineering studies for 76,000 acres of artificial wetlands to filter the pollution.

For example, the state of Karnataka has about 44,000 artificial wetlands locally constructed over many centuries.