How much would it cost to reduce Global Warming? $131Trillion is one answer. Last year the world's GDP was $85 Trillion.

Money is a sticking point in climate-change negotiations around the world. As economists warn that limiting global warming to 1.5 degrees Celsius will cost many more trillions than anticipated, WSJ looks at how the funds could be spent, and who would pay. Illustration: Preston Jessee/WSJ

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