The Copenhagen Summit sometimes gives observers the impression that elaborate formulas and systems are needed to reduce greenhouse gases. And, to be sure, a cap-and-trade system (or an equivalent) at the national level, and then coordinated at the international level, will be needed to ensure that nations are reforming their climate changing ways.
However, the above does not mean substantive greenhouse gas reductions cannot occur outside of the Copenhagen framework. They can, and one obvious way is: reduce the weight of vehicles.
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