CO2 emissions are problem now. Nuclear, if stored correctly, is a problem that gets better the longer it ages. Literally just dig a big hole in a geologically stable area, and pour it in. Problem solved. After about 1000 years, it so depleted it's barely a risk.
Ideally, we would want to focus on renewables, and store excess energy for when we need it. But another solution (which so far has been barely even mentioned) is just always> create excess power, but have "smart" loads connected to the grid to quickly suck up that excess power. Things like bitcoin mining operations, which can be spun up and down in minutes, might be a profitable method of using up excess energy in times of low demand. This would make nuclear much more viable, as the biggest problem with nuclear is it's hard to ramp up and down fast, unlike fossil fuel plants