Final answer:
Nuclear power's main environmental challenge is the long-term radioactive waste it generates, necessitating stringent regulations and careful management.
Explanation:
The primary environmental challenge associated with nuclear power is the generation of radioactive wastes with long half-lives, such as uranium mill tailings and spent reactor fuel, posing a threat to human health for thousands of years. These radioactive materials require careful handling, storage, and disposal due to their long-term risks.
Nuclear power plants generate radioactive waste that can remain hazardous for millennia, emphasizing the importance of stringent regulations and proper management to safeguard both the environment and human health.
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