How Does Nuclear Energy Affect the Environment?

Nuclear energy is propagated by science, companies, and governments as a source of clean energy source, as opposed to CO₂-producing plants.  However, the effects nuclear energy has on the environment pose serious threats that cannot be ignored or greenwashed.  The principal environmental and safety concerns are CO₂ emissions, low-level radiation, millennia of radioactive waste for 30 years of energy generation on average, cooling water system discharge that kills fish and plant life, and the threats of nuclear power plant accidents and terrorism.  Satisfactory solutions have not been found despite the attention these issues have been given for over 80 years.