1. There are thoughts about using energy to make radioactive waste harmless, but likely fusion will come early enough to not make the thought worthwhile.
2. Every process causes dangerous emissions if you keep it up long enough, even when you just warm yourself by standing in the sun.
Fusion turns Lithium and Deuterium into Helium. We've got a lot of Lithium, Deuterium is a part water - also available plenty, and since Helium isn't very dangerous we can live with it for a while, until our voices turn funny.
The Lithium is turned into Tritium before the reaction, which is midly radioactive, but it only emits beta-rays, which is the not-very-hazardeous type, e.g. shielded perfectly well by 3mm of plywood.
We can propably live with fusion until 5000 a.d.
But ultimately, their is no circle of life and any process will change our enviroment if it's kept up long enough.
Vain