Later Generations

In the beginning, in the earliest prehistoric civilizations, the energy they learned to use was just simple fire from tree branches, and the discovery of coal did not change the face of the world more. When they invented the steam engine that could effectively utilize coal, prehistoric civilization officially entered the mechanical age. Of course, that's still pretty rough. With the discovery of new energy sources, oil, and the emergence of internal combustion engines that can utilize oil, the mechanical age of prehistoric civilization began the Great Leap Forward. When prehistoric civilizations encountered destruction, they were already able to effectively utilize nuclear energy. Of course, the methods may not be mature enough, so that only a few substances could be used. This did not fundamentally change the situation of energy shortage at that time. But one thing has to be mentioned. 338 Once said that they were already trying to study the utilization of free energy at that time. Therefore, there is never a shortage of energy! People just lacked a little patience, so the war started.