A quick google search says if we only used nuclear we'd get 40g of waste per person per year assuming western energy consumption standards[1].
Multiply by 8*10^9 people (a little more than the current world population) and you get 320,000 metric tons which is about 3/5th the capacity of the largest oil tankers.
Finding a place for that much waste per year is a political problem, not a technical problem. There's plenty of geologically "safe enough to outlast the radioactivity" places we could dig a deep hole (thanks to the fossil fuel industry that is a solved problem) to dump that much waste into.
Considering the already realized catastrophic disasters due to failures of our fossil fuel transport system (Exxon Valdez comes to mind) it would still be a net improvement.
Multiply by 8*10^9 people (a little more than the current world population) and you get 320,000 metric tons which is about 3/5th the capacity of the largest oil tankers.
Finding a place for that much waste per year is a political problem, not a technical problem. There's plenty of geologically "safe enough to outlast the radioactivity" places we could dig a deep hole (thanks to the fossil fuel industry that is a solved problem) to dump that much waste into.
[1] https://whatisnuclear.com/assets/waste_per_person.pdf (no idea on source bias here, I didn't read the whole thing)