Firstly, we can define the current global economy as fossil-fuel-based, where coal, natural gas, and oil meet most of our energy demands. A hydrogen economy would be one where hydrogen runs the show. It would be even better for the planet if it were a green hydrogen economy running on green hydrogen. For that to happen, fuel-cell electric vehicles require mass adaptation, and hydrogen needs to replace natural gas in heating and industrial processes. Green hydrogen sources are vital to a green hydrogen economy backed by government action. Many nations, including Japan, the European Union, Chile, the U.S., Australia, and Spain, have green hydrogen strategies. China leads the world in renewable energy and is the world’s largest hydrogen producer. It has green hydrogen production built into its plans. Large-scale adoption would lead to a dramatic drop in greenhouse gas emissions.