Hannes van der Watt

Hydrogen has potential, but it faces some big challenges, including a lack of pipeline infrastructure. Petmal/iStock/Getty Images Pluss plus

What is hydrogen, and can it really become a climate change solution?

Hydrogen is getting a lot of attention as the EPA prepares to propose new emissions rules for power plants. But it has a problem: almost all of it used today is made from fossil fuels.

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