The world after 100 years will have changed a lot. Gas, oil, coal and all kinds of energy sources will have run out. People had to find a way to make energy. But now, energy isn't a question. The scientists created more and more things that don't need energy to work through the years. Cars no longer need oil, and the machines don't need electricity, too.
It's a new skill. You don't have to do anything to make the things work. The scientists also can use simple things to make things. They don't use complex techniques. Everyone can make things they need by themselves. Money is not a necessary thing. Peoples’ lifestyle returned back to the original one. It's a peaceful world. Besides, many people died in natural disasters in the preceding decades.There are not many people in the world in 100 years. It's a place like heaven!