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Fusion on the back on an envelope

"Back of an envelope physics is fun!" - Niek Lopes Cardozo

The energy problem, a fusion reactor and the Lawson criterion

10bn people, triple or quadrupole power generation. Sustainable? Currently world is 80% fossil. Fossil will run out, greenhouse gas emissions forbid coal depletion. Also, resources are located in politically tense areas.

When can we have fusion power?

(What does it cost will be addressed in another dread by us together)