Name an advantage of nuclear fission

No Carbon dioxide/no greenhouse gases. And no sulphur dioxide/acid rain/smog which coal-burning produces.

Nuclear fission has incredibly high energy density compared with all other fuels. Tiny amounts of material produce vast amounts of thermal energy and hence via attached turbines and generators vast amounts of electricity. For example, pound for pound, the nuclear fuel Uranium -235 provides a staggering 16,000 times as much energy per unit weight as coal.

There are many advantages of Nuclear Fission, here is a great website resource to help you out: https://www.bbc.co.uk/bitesize/guides/zyqnrwx/revision/2

An advantage of nuclear fission is that it produces no polluting gases and so therefore it does not contribute to global warming