Original sentence: It is disputed whether the risks of nuclear power can be mitigated through new technology.It is thought by some to be the cheapest energy source that can realistically be built out rapidly if fossil fuels become depleted through peak oil or discouraged because of environmental problems such as global warming, as it generates relatively little greenhouse gases.Its use is controversial because of the long term problem of storing radioactive waste, the potential for severe radioactive contamination by an accident, and the possibility that its use will lead to the proliferation of nuclear weapons.Nuclear power is energy generated from nuclear reactions or decay of an atom
Edited sentence: Its use in human society is controversial.Nuclear power is energy generated from nuclear reactions or decay of an atom nucleus.Opponents argue against it due to various risks and that there are better alternatives.Proponents argue that these risks are small and that for various reasons nuclear power is a better or more realistic energy source than alternatives