What is any energy resource that can be used in place of fossil fuel’s called

I think those are usually called "alternative fuels", or

"alternative energy sources".  Those are things like

wind, solar, hydro, geothermal, tidal, nuclear etc.

I don't like that description at all.  It makes it sound as if

there's something about them that's not quite right, and

that we don't really take them seriously.

The only thing that makes them "alternative" is that we're

just now discovering them, for the first time since we left

the caves.  

Up until now, we've always been happy to burn the stuff

that's cheap and easy to get from a hole in the ground.  

But we're just now starting to notice that it's poisoning

the air we breathe, and plus, so many people have been

using it for so long that now, it's becoming harder to get.  

So we're starting to look around now and see what else

we can use to do the job.

b brown mice / white sand dunes