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What? Radioactive waste can be solid, liquid, or gaseous waste that contains radionuclides. There are low and high level radioactive wastes. Nuclear waste is a byproduct of nuclear energy. Wherever nuclear power is used, there is nuclear waste. Nuclear power is cleaner than fossil fuels and is used in many places in the world. However, humans have not been disposing of nuclear waste properly and as a result some parts of the earth are highly radioactive, which affects not only the surrounding environment and animals, but also humans. Where? Nuclear energy supplies over 16% of the world's electricity, more than the world used from all sources in 1960. There are a total of 440 power reactors throughout the world. Today 31 countries use nuclear energy to generate up to three quarters of their electricity, and a substantial number of these depend on it for one quarter to one half of their supply. France and Lithuania get around three quarters of their power from nuclear energy, while Belgium, Bulgaria, Hungary, Japan, Slovakia, South Korea, Sweden, Switzerl