Solar panels work near the small town of Milagro, Navarra Province, northern Spain, Friday, February 24, 2023. Spain is building on its reputation in renewable energy to position itself as Europe's future leader in green hydrogen. But some energy sector experts express caution over ramping up an industry that would be wholly reliant on massive increases in the availability of zero-carbon electricity made from sources like wind or solar. (Photo by Alvaro Barrientos/AP Photo)
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