A global solution must include measures that reduce emissions of carbon dioxide and other greenhouse gases, but which do so at the lowest costs to the economies of the world, Topfer said. Big cities are key factors in both the problem and the solution, he said. They are where most of the world's fuel is burned, thus where most of the carbon dioxide is generated. And if there are to be changes and more efficient systems, they need to happen in cities. The summit, being held at the Hilton Hawaiian Village, includes more than 400 delegates from 29 countries.
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