Nothing has "no pollution". Fusion plants in particular would have some radioactive waste.

I'm also very sceptical it will be possible to build them at anything like an acceptable cost. 10% of the Sahara desert covered in solar panels would supply our present electricity needs, without reducing land for food growing, and would be technically far easier. (Though obviously we need to worry about what to do at night). But that is also far too expensive at present. But roughly speaking, if fusion isn't cheap enough to compete with solar, then it's a waste of time.