We use a steam plasma to do Molecular Nuclear Fusion
The plasma, once started will self sustain. Best done in the cold lands, so we can dump he fusion heat to the air. We have a chain of Carnot systems, that use decreased pressure to drop the temperature of the gases.
So for 40kW, we cool the air from 700oC, to below -272.2°C - freezing point of helium. We also produce liquid oxygen, at below -218.8°C . Through a chain of Carnot coolers.
So liquid helium is worth more, weight for weight than gold - about $5.00 per litre . LOX has hgih commercial value and price (Liquid oxygen) - Buy Liquid Oxygen or Compressed Oxygen Gas (O2) | Praxair, Inc.
So Canada and Greenland could have massive liquid gases industries. We pass the hot plasma vent gases through a thermoelectric generator, and produce 500 kW of carbon free power. That will power all our Carnot pumps.
So we make our helium by doing Molecular Nuclear Fusion – and it is lost to space, so we need t omine the asteroid belt for asteroids. Using robot mining ships, to lasso the ice meteorites, and bring them back to the Earth.
We cease to burn Fossil Fuels for power – we use steam plasma tubes. I gave Sheffield University the idea of Molecular Nuclear Fusion in 2001.
They were not interested. They were still researching Global Warming, 5 years after the natural climate started cooling.