Even if it would be cheap to launch junk into space, we'd still have to solve some of the same issues we'd have to solve now as well: collection. To put it on a

Even if it would be cheap to launch junk into space, we'd still have to solve some of the same issues we'd have to solve now as well: collection. To put it on a rocket, you'd have to collect the junk first, which we currently don't do well (except in a couple of countries). Nuclear waste is well collected though, I'd say. Breaking that down to it's constituent protons and neutrons would make it harmless right? Though I have no idea how much energy that would cost, only that the lower bound is probably well above what is reasonable.