Hydrogen can be produced from water and sunlight, then returns to water when used as fuel.
There are complications. Hydrogen loves to escape or explode. Expensive metals such as platinum are still used in the best conversion processes. A lot of experts don’t believe hydrogen will win over batteries.
There are alternatives. Ammonia is a big one. Ammonia can be made from water, air, and sunlight, then returns to air and water when used as fuel. And it’s much better behaved than hydrogen. Some experts have regarded ammonia the fuel of the future.
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