It's unfortunate that this is such a common belief. There is no silver bullet for solving these problems. Yes, nuclear energy has a part to play. But it's a relatively small part, and absolutely not "a solution" in itself.

MIT has a really neat policy simulator called En-ROADS [1] where you can tinker with applying various policies at various levels, and estimate their impacts. Check it out, and see just how minimal nuclear energy's effects are on their own. Compare that to, for example, just "highly reducing" methane emissions.

[1] https://en-roads.climateinteractive.org/scenario.html?v=23.2...