Elon Musk just demanded a carbon tax in Paris

Tesla and SpaceX CEO Elon Musk gave a speech in Paris on Wednesday at the Sorbonne, and he called in no uncertain terms for a carbon tax.

"We have to fix the unpriced externality," he told the audience, shifting into the wonky quasi-academic mode that he actually appears to enjoy indulging in, when he isn't running two companies and serving as the Chairman of a third, Solar City.

His entire speech hinged on this simple observation: that the addition of carbon to the atmosphere is effectively a worldwide subsidy that's contributing to global warming and preventing humanity from freeing itself from the fossil fuel era.

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