Nobody has mentioned space-based solar power yet (https://www.nasa.gov/wp-content/uploads/2024/01/otps-sbsp-report-final-tagged-approved-1-8-24-tagged-v2.pdf ht

Nobody has mentioned space-based solar power yet (https://www.nasa.gov/wp-content/uploads/2024/01/otps-sbsp-report-final-tagged-approved-1-8-24-tagged-v2.pdf https://www.nasa.gov/wp-content/uploads/2024/01/otps-sbsp-re...: "Launch is the largest cost driver..."), which would the cheapest (and currently only technologically feasible) route to turn humanity into a Kardashev Type 1 (or 2 if we construct a Dyson swarm) civilization (without really cheap fusion reactors).