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Both candidates say they support renewable energy. Romney, though, would do little to create markets for it.
A carbon-emissions limit will raise energy prices unevenly.
Economists and utilities say the draft legislation could help avoid costly regulations.
Obama will propose a climate plan, but his options are limited without congressional support.
Building denser cities would do little to reduce CO2 emissions, a new NAS report concludes.
Despite subsidies and new projects, carbon dioxide sequestration is still a long way off.
The Advanced Research Projects Agency for Energy is highly popular, but its impact so far has been minuscule.