Final answer:
The two pros of nuclear energy are its high efficiency as an energy source and the potential for producing less radioactive waste, especially in the case of nuclear fusion reactors.
Step-by-step explanation:
The pros of nuclear energy mentioned in the question include its efficiency as an energy source and potentially less production of radioactive waste compared with other types of nuclear reactors. Compared to traditional fossil fuels, nuclear energy is vastly more efficient, meaning it can produce a large amount of energy from a relatively small amount of fuel. Furthermore, although nuclear energy does produce waste, the transition towards nuclear fusion reactors could potentially reduce the amount of long-lived radioactive waste produced, as fusion reactors are expected to produce less radioactive waste than fission reactors, which is considered a significant advantage.