He is probably referring to the small amount of nuclear waste that is actually produced per watt of power, it is a lot more dangerous if you are in direct contact, but it is surprisingly easy to store safely, and remove all environmental impact. The biggest environmental issue with nuclear is the mining and enriching, both of which are realistically too small to factor in.

I found this article going into more depth nuclear waste .

What’s the combination…

1,2,3,4,5

That’s amazing, I have the same combination on my luggage.