Green hydrogen, an alternative fuel generated with clean energy, is experiencing a global resurgence and has been identified as the clean energy source that could help bring the world to net-zero emissions in the coming decades. It was initially touted in the U.S. during President George W. Bush’s first term, when it was nicknamed the “freedom fuel.” Now, President-elect Joe Biden is promising that the U.S. will be able to access green hydrogen at the same cost as conventional hydrogen within a decade as part of his clean energy plan. Several countries around the world already invest heavily into it, including Chile, Japan, Saudi Arabia, Germany and Australia. The market for green hydrogen is expected to grow exponentially in the coming decade, experts told ABC News. “It puts the spotlight on [hydrogen] gas for the first time,” a study published in Nature in July stated. “And the gas industry is turning to hydrogen for a new lease of life.” However, the disadvantages of green hydrogen may be equal to its advantages, Bloomberg New Energy Finance analyst Michael Liebreich wrote in an essay published in October.