Is Nuclear Energy Renewable Energy?

    From the perspective of the universe, there is no renewable energy in the world. The entropy of this isolated system keeps increasing, which means that there won't be available energy in the whole universe long time after.

   For humans, the word "renewable" refers to the usage of time scales. For individuals, the basic time scale is 100 years. After 100 years, he/she will die. If taking into account the entire human era, the time may not exceed one billion years. In the future, we now in this energy system has long been abandoned by us.

   Nuclear energy, solar energy, etc., is called renewable energy, that is the case.