I don't think fusion energy is even possible. I hope I am wrong.
Hydrogen is a viable alternative to a hydrocarbon economy but requires a pressurized vessel and pipeline. It is also extremely volatile.
Nothing is better than hydrocarbons for energy density and safety. An A380 can carry 600 people 10,000 miles with 85,000 gallons of Jet-A. You want to use a battery in an A380? It would be FAR too heavy to even get off the ground. Hydrocarbons are here to stay forever unless we all want to go back to living in caves...The few who actually survive, that is. Hydrocarbon oxidation also releases sequestered H2O and CO2 which are critical for biological life on Earth...Burning gasoline/diesel/jet-A makes plants green and yummy for animals that Sapiens eat.
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