World Energy Problem

I think, for the long term future of humanity, just having renewable clean energy (solar, wind, wave) is not really enough! If we really want to improve the future of our world, we need renewable clean energy but also astronomical amounts of it!

Why? Realize that, we could really transform our world, if we had astronomical amounts of energy to spend. For example, titanium is an extremely light, strong, durable material. And our world has plenty of it to use for anything. But mining it at large scale requires enormous amounts of energy. If we had enough energy for it, we could build all our vehicles, buildings, homes, bridges, roads, infrastructure from titanium, for example. Then, they all would last pretty much as long as we want/need! Imagine how much maintenance costs would be saved in the long term!

Also keep in mind, titanium is just one example. Similar situation exists for aluminum, also. Aluminum is also an extremely useful dream material, and it is also plenty in Earth's crust, but it also requires a lot of electricity to mine. Another example is glass. Imagine, if we could produce glass bricks very cheap, then we could use them in all kinds of buildings (as walls), for example.

Also water desalinization (using sea water) at large scale requires enormous amounts of energy, also moving water across continents (using pipeline networks) at large scale requires enormous amounts of energy. If we had enough energy for it, we could provide enough clean water to anywhere anytime, for cities, agriculture, even for creating new large forests!

Also realize that electricity is a big part of the total cost for pretty much anything we produce and use/consume. If we had really plenty electricity, price of pretty much everything would significantly drop (in different levels for different things) and also availability of pretty much everything would significantly increase (in different levels for different things).

And that is why, we as humanity need to keep researching/experimenting clean fission/fusion!