High level radioactive waste takes thousands of years to reach it's half life.
Electricity is a secondary energy source because the energy first has to be produced to make this which then powers things.
Renewable energy sources include:
Burning carbon fuels in power stations produces carbon dioxide.
Nuclear fission is where an atom is split into 2, neutrons go flying out and these break other atoms into 2, when this happens it is a chain reaction.
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