Many people are proponents of using nuclear power instead of burning coal to generate electricity. what is an environmental disadvantage of using nuclear power?

A key disadvantage that nuclear power generation poses is the production of radioactive waste, which is highly hazardous to most forms of life, therefore it must be handled and stored appropriately to reduce the risk of contaminating the environment and the public. This is generally an expensive and very, very lengthy process as it requires the management of waste until the radioactivity decays enough to the point where it's no longer a threat.