And how much CO2 and other environmental damage would there be from covering vast swaths of land with solar panels? The manufacturing process is filthy, the disposal process even worse, and it results in more human lives lost than nuclear.
Nuclear can scale up very easily and rapidly. It merely requires the balls to bring down the miles of red tape standing in the way of building new reactors and reprocessing their waste. It handles base load and we know that it works because we've been using it for decades. If you want to bet the farm on something, bet it on something we already know works. As for the fuel, CANDU plants can already breed fuel from thorium and it can use MOX fuel including the weapons-grade plutonium from all those decommissioned nuclear weapons we have laying around.
There's plenty of fuel, waste is ridiculously tiny and low risk if you reprocess the fuel, it scales very well, and we know it works for all kinds of load. Why you'd want to bet human civilization on something new that's more damaging to the environment, causes more human fatalities, and has many unknown risks associated with it is beyond me, but I can say that it won't scale to what we'd need without obscene amounts of environmental damage and unknown risks to the overall climate.
The real solution involves using proven safe, clean technology on a larger scale.