Nuclear is vastly more efficient than wind and solar, requiring much less copper, concrete, and ground space for the same amount of available energy. Plus this is entirely controllable production, requiring only minimal hydro power for production smoothing (French nukes can ramp up from 0 to 100% or the reverse in 10 minutes), while wind and solar produce whenever they want, and therefore require either storage (no technology exists at scale, particularly nothing that could be massively available and producing in the next couple of decades) or backup production (usually gas, which is really bad from a CO2 point of view).

That's why Germany's Energiewende is going into the wall: it's already much more expensive than planned, and will require humongous additional investment, so far for very limited impact on absolute emissions. Remember that what counts for the climate are absolute emissions, not relative proportions of low-carbon and high-carbon production!