If you propose nuclear energy as a solution for CO2 emission, you're proposing it for everybody. That means America, UK, Ireland, Sweden, Germany, Russia, China, Papua New Guinea, Indonesia, Mexico, Venezuela, Croatia, Serbia, Libya, Lebanon, Iran, Afghanistan, Togo, Rwanda, Congo, etc. etc.

Nuclear power is per se dangerous but, with good engineers, controllable. The world has fewer good engineers than it needs. The waste is dangerous, and has to be stored a very long time, because some of the products are both very long- lasting, and can be converted to weapons, either explosive or for contamination.

The nuclear reactor program was never purely for power- in most countries which currently possess reactors, the primary (but secret) purpose was to produce weapons- grade material, much easier using a reactor than by refining the raw uranium.