Which of the six proposals makes the most sense? Cast your vote.
For Fairness, Use Formulas: Use a mathematical formula -- not negotiations about targets -- to set binding emissions standards for each country based on factors like historical & current emissions, GDP, and population.
Strengthen Kyoto: Expand the idea of binding, country-specific emissions targets that let developing countries “graduate” to stricter standards as their economies develop.
Create 'Climate Clubs': Only the major-player countries need to negotiate, in small regional groups, and meeting their goals through emissions trading.
Let Countries Handle It : Allow domestic (but not international) emissions trading, and let countries set their own national limits on emissions.
Research More Flexible, Creative Solutions: Countries pledge actions, not targets, to reduce emissions, and support flexibility, research and development.
Be Realistic: Ask countries to pledge what they can with strong domestic support, then rely on public shaming to keep them on track.

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Note: This is an unscientific survey of washingtonpost.com readers.