Don’t take my word for it. Look up the numbers for yourself and do the math.
Search for “National GHG inventory {your country}”.
You find a report listing (among a bunch of other things) the amount of electricity generated each year by each method, and the emissions from each. Look up the total TWh of electricity produced by fossil fuels.
Then look at the total TWh from renewables, and rate it has been growing Y-o-Y and extrapolate until it reaches the number needed to eliminate fossil fuels.
You’ll find it will take decades to build enough renewable capacity to replace fossil fuel based electricity generation.
And that’s before you realize that only about 25% of fossil fuel combustion goes to electricity generation. As we start switching cars, homes, industries to electric we’re going to need 2x-3x more electricity generation.
Yes it takes a long time to bring on a new nuclear plant, roughly 7-9 years. If it was remotely realistic that we could build enough renewable power generation in that time to replace all fossil fuel generation then I’d agree we don’t need nuclear. But we’re not anywhere close to that.
It’s also helpful to note too just how much power a nuclear reactor generates. I live in Canada, our second smallest nuclear power plant in Pickering, generates almost 5 times more electricity annually than all of Canada’s solar farms combined. It will take 1000s or solar and wind farms covering and area larger than all of our major cities combined to replace fossil fuels…
…or about 7 nuclear power stations the same size as Pickering.