If we follow the premise that all things on Earth are finite such as the physical resources we use then we must assume that at some point we will begin to run out of these resources as they are more heavily utilized. Our use of energy is one such item that should be addressed by the average person before we hit the wall of these limited resources.
There are those that think solar and wind will be the salvation of our energy problems but these people fail to take into account the limitations of these energy sources. It still requires energy to extract the raw materials needed to build solar panels and these must be replaced at some point. Wind turbines require steel, concrete, fiberglass and copper just to name a few of the resources needed to make these things work and they too must be replaced every few decades as they wear out.
One problem with solar that I have talked about to people is the fact that massive amounts of energy must be stored in order for it to power the grid continuously. One person recently calculated that batteries to store enough energy to power the U.S for one day would require batteries covering 923 sq. miles and costing 41 trillion dollars. While I am an advocate of wind and solar I do not believe they are capable of powering our grid reliably. I think their benefits can only be utilized as stand alone systems on individual buildings.
Those that think solar and wind can replace oil do not understand our energy requirements at the present time and certainly do not understand the power requirements of things such as ships, trains and semi trucks that move the bulk of our commodities around the world. Cheap oil has made the current world trade system possible and the lack of cheap energy will cause a collapse of the status quo. The collapse of our current energy system will cause widespread chaos and depressed living standards if we do not address this issue now. It is for this reason that we need to look forward to the energy we will use in the future.
Hydrogen is more akin to a storage battery as it takes energy to separate the hydrogen from other elements to utilize in most cases. Fusion is still a promising energy source that we still do not know how to produce and maybe in the future if we figure it out it will change things but that is some time off. Things such as oil, natural gas and coal are heavily used today but they will only last so long and a growing population is using them at a faster rate as time goes on insuring their demise at some point. Nuclear power plants are filled with controversy and their future is uncertain unless something changes