Our only sustainable hope is a deuterium-tritium fusion reactor that produces He-4 as byproduct[1]. OR mining He-3 from Jupiter[2]. [1] https://en.wikipedia.o

Our only sustainable hope is a deuterium-tritium fusion reactor that produces He-4 as byproduct[1]. OR mining He-3 from Jupiter[2]. [1] https://en.wikipedia.org/wiki/Deuterium%E2%80%93tritium_fusion https://en.wikipedia.org/wiki/Deuterium%E2%80%93tritium_fusi... [2] https://www.esa.int/Enabling_Support/Preparing_for_the_Future/Space_for_Earth/Energy/Helium-3_mining_on_the_lunar_surface https://www.esa.int/Enabling_Support/Preparing_for_the_Futur...