Nuclear pollution refers to the harmful effects caused by radioactive substances and radiation on the environment, stemming from activities such as uranium mining, nuclear fission, and accidents. It weakens the immune system, contaminates water, contributes to global warming, and causes severe health issues, exemplified by historical incidents like Hiroshima, Nagasaki, Fukushima, and Chernobyl. Preventative measures include proper maintenance of nuclear facilities, safe disposal of radioactive materials, and minimizing nuclear experiments and fission reactions.