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Despite their political popularity, carbon tariffs will be next to impossible to implement effectively, and as such will do little to solve the climate problem.
Controlling the climate with technology was once the stuff of science fiction. But with tests already underway, there's an urgent need for global governance of geoengineering. Mason Inman reports.
Wetlands store vast amounts of carbon, but efforts to make them eligible for credits under a global climate treaty could prove tricky. Melanie Lenart reports.