What byproduct of nuclear energy has caused concerns about the use of this resource and why?

Byproduct of Nuclear Energy: Nuclear Waste

Explanation:

Nuclear waste has caused plenty of concern over the health of humans and the environment. Since nuclear wastes can last for hundreds of years, it is difficult to find areas where we can store it. Nuclear waste is toxic to humans and the environment, and I believe even some are even radioactive. The byproduct is buried deep underground surrounded by cement and concrete but can still leak through.

i think its 100.

hope this !