He changed the topic from nuclear to coal.

That's like arguing why take chemo if it only makes you sicker in the short run. 🤔

And because they shut down their nuclear plants, they had to start burning coal again...

Unrelated and a whataboutism.

Nuclear has been at that supply level since the 1970s. Other parts of the world have much higher renewable mixes in their energy inputs. For example, Germany:

https://www.reuters.com/business/energy/germany-likely-pass-50-mark-renewable-power-this-year-minister-2023-09-18/

Nuclear is not necessary to meet climate change targets. In fact, it's so damned expensive to deploy and maintain, it will harm meeting those targets.

One of these days they'll get it: To fly one must merely not hit the ground.