Question

Nuclear fission or fusion is more safer for the environment?

Answer 1

Nuclear Fusion is more safer comparatively because Fission only produces more energy than it consumes in large nuclei (common examples are Uranium & Plutonium, which have around 240 nucleons (nucleon = proton or neutron)). Fusion only produces more energy than it consumes in small nuclei (in stars, Hydrogen & its isotopes fusing into Helium).

Answer 2

Nuclear fusion is safer