1.   Although anthropogenic emissions of sulphur dioxide account for only half of the total global emission, they tend to be very concentrated.

2.   Governments, airlines and passengers should take action to curb global emissions, the report concluded.

3.   And if the Clinton administration has its way, a similar system of market-based permits will someday be used to limit global emissions of greenhouse gases.

4.   Instead, however, global emissions continued to rise.

5.   This might be accomplished, he said, by holding global emissions roughly constant for the first half of the next century, and then beginning to reduce them.

6.   Without commitment from countries such as like Venezuela, it could be difficult to make a global emissions trading system work.

7.   But the United States, responsible for one-quarter of global emissions, has yet to commit to specifics.

8.   But the United States, responsible for one-quarter of global emissions, has yet to commit to specific targets and timetables.

9.   Coral reefs around the world are under threat from global emissions of greenhouse gases, a group of scientific experts warned Tuesday.