I don't know how much more material you need for solar panels and wind turbines compared to nuclear reactors (there's a lot of concrete in a nuclear reactor too

I don't know how much more material you need for solar panels and wind turbines compared to nuclear reactors (there's a lot of concrete in a nuclear reactor too). But as you build more renewables the amount of fossil fuels you need for manufacturing goes down. It would of course be nice if externalities were better reflected in prices.