Nuclear energy may play a role in future energy supplies but it is not able to replace fossil fuels as sources of energy. It too suffers from resource constraints as its abundance in the earth's crust is very low. Fusion energy has yet to be demonstrated on a commercial scale and like nuclear energy cannot serve as a replacement for fossil fuels.
Termotuumaenergeetika peab end kommertstasandil veel tõestama ning nagu tuumaenergiagi, ei suuda see asendada fossiilkütuseid.