Nuclear energy is one of the cleanest, most efficient, and most available sources of power on Earth, but it might not be the best choice over time. Currently, nuclear energy is the cleanest energy source other than wind, because in 48 minutes, a typical household will only emit 12 grams of Carbon Dioxide from nuclear plants. Meanwhile, coal plants emit 820 grams of Carbon Dioxide to produce the same energy, which is worse now, but in the long term nuclear plants may be more dangerous because nuclear material is possibly the most dangerous substance on Earth.
Two times in history, nuclear power plants have leaked significant amounts of radiation in 1986 and 2011, so this still remains a threat to the Earth. Today, both sites still have exclusion zones where people cannot safely live due to ongoing radiation, so nuclear plants pose a problem even with the cleanest source of energy. These leaks have not only caused environmental problems, but also economic damages costing hundreds of billions of dollars. Even though all issues must be considered, the biggest problem with nuclear energy is the nuclear waste, which may continue to emit a lethal dose of radiation for hundreds of thousands of years. In order to save the Earth, this waste must be put away where it can remain isolated and undisturbed, which is very hard to do, so scientists continue to explore more clean energy sources.