Early last year, environmental groups began seriously complaining that American pollution laws were being evaded by goods from heavily polluting factories overseas.

Cairo also has many unregistered lead and copper smelters which heavily pollute the city.

No significant industry had developed since the 1740s to cause irreversible damage to the flow of the river or to heavily pollute its waters.

The 20th century saw the gradual decline of mining and the heavily polluting industries such as iron-making.

In London we have low-emission zones, where if you have a heavily polluting vehicle you have to pay to drive through - that's the stick.

In 1996, California's government sought to enforce stricter Smog Check tests because the more populated areas of the state were heavily polluting.

These include companies that pollute heavily and pharmaceutical companies that do not sell into the developing world.

Hitherto, significant investment has been provided for coal-fired power plants, and this continues to make these poor countries dependent on fossil fuel, which heavily pollutes the environment.

The legislators who passed new-source review expected the law to encourage electric utilities to replace old, heavily polluting coal-fired plants with cleaner new ones.

The current state of the science on this is that it's heavily polluting both in terms of groundwater and the climate.