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Charting the Planet's Path to 100% Renewable Energy

A speedy transition to wind, water, and solar could avert catastrophic climate change. For the 139 countries that backed the Paris agreement, it’s within reach.
A worker inspects solar panels northwest of Lanzhou, Gansu Province.
A worker inspects solar panels northwest of Lanzhou, Gansu Province.Carlos Barria/Reuters
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Updated on August 24 at 3 p.m.

How quickly could the majority of planet wean itself off of coal, oil, and gas? For $124.7 trillion, perhaps within just a few decades.