Ask MIT Climate Expert: How clean is 'green hydrogen'?

Hydrogen is often held up as a potential clean fuel of the future, because it can be burned like oil or gas but releases no climate-warming carbon dioxide (CO2)— only water. But while hydrogen is the most abundant element in the universe, there isn’t an easy-to-tap source of pure hydrogen available on Earth. To use it, society must manufacture it.That manufacturing process can release climate…

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