1.   He said that petro-chemical plants with little or no pollution controls were releasing hundreds of thousands of tonnes of toxic waste into the atmosphere every year.

2.   The basic unit of trade will be the right to emit one ton of sulphur dioxide into the atmosphere each year.

3.   But the atmosphere this year is especially charged, with the impeachment process under way just as Congress is trying to wrap up its must-do business.

4.   The abundance of water nearby provides a ripe source of moisture for the atmosphere all year, allowing for rainfall records in all seasons.

5.   Millions of tonnes are spewed into the atmosphere each year.