The best-kept secret of Meucci, the Italian high school, is its green boiler. It's tucked away amidst the tall trees in its garden and a fenced concrete structure, but it has piqued the curiosity of its students about this promising new energy source.

Will hydrogen become the new petrol? Does it pollute? How much does it cost?

To answer their questions, we talk to Rosalinde van der Vlies, the Director of Clean Planet in DG Research and Innovation at the European Commission.

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