Solar power will be the final answer: clean, inexhaustible.
I have additional concerns. Remember basic physics that energy cannot be created or destroyed?
Well, every "watt" of solar energy that we would use is a "watt" that doesn't go where it currently is going. Understand, the "watts" a house may use is in-signficant when compared to the "watts" being received ..... but think of it this way .... if the solar "watts" are keeping the earth warm and growing plants, etc..... if we use enough of them then we will have a cooling issue or dying vegetation ....
It is impossible to take these solar "watts" without affecting something ... yes, the effect is probably insignificant, but as we add and add and add .....
Here's a thought .... some people are sinking turbines in the ocean and having the currents turn them to create power. Brilliant idea. And people say "inexhaustible". But!!!! It is easy to see that these turbines have to slow down the current passing through them .... they convert current to electricity.
Put enough of them in a single location and the reduction in current speed is measureable.
Put enough of them in that nice warm current that lands in England .... and without a doubt there will be climate change in England.
We can take from one source and be insignificant .... but there are limits to all of these "wonder" sources of power.
Put up enough solar panels and the ground underneath will cool.
Put up enough sea turbines and the warm currents will decrease.
Heck, there is even the driving holes into the earth to tap into the nice and hot magma down there to make steam and drive turbines .... enough of them (measured in the billions of course) has to cool the earth's core. I know I know I know .... these are extreme cases .... but still must be considered.
There is no free lunch ....
We live in a closed system ....