Time Magazine reports that nuclear energy is having a mixed reception at COP26, One group sees it as a source of energy that does not contribute to global warming, but another sees it as just another source of pollution. Natural gas faces an equally mixed reception, since it contributes less to global warming than coal, but it still releases carbon dioxde. France and Russia are champions of nuclear power, with US support, but Germany, Belgium, New Zealand, and Austria oppose including nuclear as a green power source.
One argument against nuclear plants is that they take a long time to build and are expensive. But that may be an argument to get started soon if we are going to need them.