Does the questioner want to ask "Is nuclear energy the most efficient, lowest carbon and safest energy source in the current energy industry?" Yes. After inquiry, the most efficient, lowest carbon and safest energy source in the energy industry is nuclear energy, so it is. Energy refers to resources that can provide energy. The energy here usually refers to thermal energy, electrical energy, light energy, mechanical energy, chemical energy, etc. Substances that can provide kinetic energy, mechanical energy and energy to humans.