For a century, electrochemistry was the quiet workhorse of the basement—plating jewelry and refining aluminum. But in this room, it had become the conductor of a new symphony. No smokestacks, no drilling, no combustion. Just the elegant, silent transfer of electrons, turning the planet's waste back into its lifeblood.

On the left, pure hydrogen hissed into a pressurized vein, ready to fuel a fleet of transcontinental trucks. On the right, carbon dioxide—captured directly from the local atmosphere—was being forced into a marriage with water.

Elena looked. The sensors confirmed it: they were producing high-density aviation fuel out of thin air and seawater.