In the nearly 20 years since the first carbon trading market was established as an economic approach to addressing climate change, a patchwork of compulsory and voluntary markets has sprung up, with varying success and challenges. On this week's episode of Reuters Econ World, guest host Christopher Walljasper sits down with deputy editor for energy and commodities Nina Chestney and climate reporter Jake Spring explain how these markets work, and their impact on the climate.

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