11.   One is an emissions trading scheme that is designed to use market mechanisms to allow countries to achieve their emissions targets at the lowest possible cost.

12.   Participants can meet emission targets by purchasing pollution control equipment, changing materials used to produce products or purchasing emission credits in the smog market.

13.   Rather, she suggested, the poorer countries might voluntarily, or as a result of future negotiations, adopt emission growth targets.

14.   Setting differentiated emissions targets among countries with widely diverse histories and national circumstances will be especially difficult.

15.   The accord deliberately offered utilities maximum leeway in meeting emissions reduction targets -- anything from insulating houses to subsidizing electric cars.

16.   The emission targets will never be met without the cooperation of the developing countries, and they will not consent.

17.   The developing countries upset the conference by refusing to commit themselves to emission reduction targets that their wealthier counterparts have pledged to meet under the agreement.

18.   The groups denounced the United States and other countries that sought forest credits, including Japan, Canada and Australia, as trying to weaken emission targets.

19.   The region will be unable to spend federal funds on new road projects until it has a federally approved plan to meet vehicle emissions targets.

20.   There is an important alternative to setting national emission targets.