Green hydrogen is forecast to meet global energy needs that will not be easily satisfied by battery, wind or solar power, Gregory Nemet, professor of public affairs at the University of Wisconsin’s Energy Institute, told ABC News in 2021. Batteries, for example, currently can take up a lot of space and also weigh a lot, making their use an issue for air travel and long-haul trucking. Hydrogen, by contrast, doesn’t include those challenges and also stores better long-term.