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The president has taken direct aim at the state’s climate efforts, including moves to block California’s gas car ban, pull funding from its green hydrogen hub, withhold disaster aid, and undermine its cap-and-trade program.

Scotland's abundance of wind means generating green hydrogen from electricity has huge potential.

An initial £5.8bn injection was earmarked for green projects including "carbon capture, green hydrogen, ports, gigafactories and green steel," according to UK government documents.

Green hydrogen has long been touted as the climate-friendly energy solution of the future.

Through hours of interviews with industry stakeholders, reviews of documents and their participation in conferences and workshops, the researchers have identified the main reasons behind the lack of investment in green hydrogen.