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To a growing number of people throughout the world, the case for addressing runaway climate change is obvious. Still, the sweeping policies needed to stave off further warming must address fundamental economic realities: –Is it possible–and politically feasible–for the U.S. to transition to 100% renewable energy in time to avoid a dangerous climate tipping point? –Will a tax on carbon be necessary to reduce carbon emissions? What are the externalities and hidden costs? –Doesn’t it make huge sense to become energy efficient and cut costs regardless of climate threats? We asked three nationally-known energy policy experts to share their visions for an energy future that makes economic sense while achieving the carbon reduction goals necessary to ensure a safe and habitable planet.