Deuterium, which comes from seawater, is virtually limitless in supply. Tritium supplies will take 50,000 years to run out. One litre of the fuel is equivalent, in terms of energy, to about 300 litres of oil.
(Below inset of a rendition of Tokamak. A Brutalist structure that's more or less simply a concrete doughnut with pillars that arch over into a hollow centre. 'Man to scale' says arrow to stick figure of, about.. a hundredth the width of the reactor? and a fifth in height. So like, one city block I guess, size of reactor.)
Illustrations were numbered boxes next to elements in illustration.
Bottom is a Brutalist world but with plenty greenery and fancy vehicles on empty lanes.
Top is also Brutalist but mostly brown-grey from sunset and fog and streetlights of a decidedly more urban landscape. One unmentioned element is child and parent with full hazmat suits looking out at the roadway scenery from sidewalk.
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