There Ain't No Silver Lining On That Cloud, It's Nuclear Fallout
If someone put a thumb* to my head and said, "Which is better for the environment? A nuclear plant or a coal plant without any form of carbon capture?" I would say, "A nuclear plant would be much better, hands down. Even all three hands down." But even better would be neither. This is because solar and wind and other forms of low emission electricity generation are much cheaper and we can use the money saved to either clean up the environment or just make ourselves richer. Either of these options is good compared to neither.
* I hate it when people press their thumbs against my head.