Watch Elon Musk and Exxon Finally Agree on Something

Here's the climate deal everyone really wants.

The One Idea Climate Change Adversaries Agree On

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Elon Musk and Exxon Mobil Chief Executive Officer Rex Tillerson have starkly different visions of the world. But on the best tool for fighting climate change, they agree.

The idea is to put a price on greenhouse-gas emissions: in its purest form, a carbon tax. It's the most effective way to cut emissions, and it's a policy supported by everyone from Al Gore to the biggest oil companies on earth.