Over the last several decades, scientists have addressed the problem of nonrenewable natural resources such as fossil fuels. humans are using fossil fuels at a rapid rate and scientists believe that one day we will run out of them. to solve this problem, research has been conducted on alternative energy sources. one alternative energy source is nuclear energy. although nuclear energy is a good solution to this problem, there are concerns.

all but one of these describe a concern about nuclear energy.
a) presence of radioactive waste
b) little if any carbon emissions released into the air
c) contamination risk when transporting radioactive materials
d) thermal pollution from water released into nearby environment