At the moment the best way to carry a quantity of energy is compression of the lightest metal. Perhaps creation of a pure proton metal would exceed the density of compression of the vapor. One can be sure our energy needs are coming from the proton. ExxonMobil is creating a decarbonizion device to produce 1 billion gallons a day in equivalent hydrogen. Sourced from natural gas our most abundant energy source. Agriculture can easily be involved in composting to source methane. The resulting CO² from the process should be feed to organic life, as a more efficient with a lower impact environmentally. Greenhouse grown hemp can produce many profitable products, even eventually replacing alcohol as a social libation putting the stars in Starbucks. Hemp fiber, and feed for cattle. All of this would move a lot of agriculture indoors, perhaps in long tunnels under ground. Summing up that studies show HEMP is an excellent absorption candidate for CO² while requiring less water than cotton. All of this puts H² in a bottle which has an energy density attractive for aircraft fuel. That 90 bar bottle of hydrogen will tow your boat around the world while also powering the boat in the water. The future in very different as we discover how to increase compression, and how to make generators that fit the palm of your hand so that your power tools run on the blue gas. I long ago invented a better wind machine back in 1980. Investors told me it had no future, I love to live long enough to see this proven wrong. Energy is the ultimate currency, Elon is learning how true that is.