Officials said they would lobby the United States and other large polluters to do the same.

It details which corporations are the largest polluters and the relative emission levels of various pollutants by companies.

In fact, they conclude that trading has led the largest polluters to clean up the most and thus cooled the hottest spots of all.

Environmentalists often use greenwashing to describe the actions of energy companies, which are traditionally the largest polluters.

Although 118 countries have ratified the treaty, it will not go into effect without the participation of the world's largest polluters.

They are one of the largest polluters in the state.

Some environmental groups have said that it is also the state's largest polluter.

Senior environmental agency officials said the economics of their approach would encourage the largest polluters to move first to control mercury.

The United States has the world's largest economy and is one of its largest polluters.

Developing nations have refused, saying wealthy countries are among the largest polluters and should clean up first.