Tech CEO Luke Iseman has an idea he wants to sell the world: A business plan to cool the Earth by dimming the amount of sunlight that hits the planet. As WSJ’s Eric Niiler explains, the principle behind the idea, geoengineering, is getting big investment but is also sparking serious scientific debate.

Further Reading:

- Mexico Bans Climate Startup’s Experiment to Cool the Earth 

Further Listening:

- Banks’ Alliance to Fight Climate Change is on the Rocks  

- Why an Arctic Treasure is Spurring Hope and Dread 

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