We don't need new technology, it took France only about 20 years to replace it's coal and oil based electric generation with nuclear power generation (between 1976 and 2000).
Because of lack of political will in US and many European countries we continued to burn fuels to generate electric energy.
Because of lack of political will in US and many European countries we continued to burn fuels to generate electric energy.
https://world-nuclear.org/information-library/country-profil...
Developing countries like China and India prioritized cheap coal power generation.