1.   The market will allow firms to buy up current and future pollution allowances.

2.   Even more significant, the agreement may eventually lead to an international trade in pollution allowances.

3.   Niagara Mohawk and Arizona Public Service agreed to trade air pollution allowances.

4.   Probably more significant, the agreement opens the prospect of international trading in pollution allowances.

5.   Power plants instead would be given pollution allowances, which they could trade with each other for money.

6.   Utilities can obtain the credits by falling below pollution allowances the government sets.

7.   Utilities can do that by falling below pollution allowances the government sets.