Fossil fuels are called that because it is what they are made out of. Fossils. The remains of something once living.
I heard an interesting spin on this via Douglas Rushkoff's Team Human podcast episode with Tyson Yunkaporta. (here's a timestamped Overcast link.)
Our progression along the continuum of energy sources has been further and further into the past.
First hundreds of years with wood.
Then thousands with coal.
Then tens of thousands with dinosaurs.
Then in the millions or more with uranium.
In this context, many renewable energy sources make complete sense as our next primary source. They are older still (except maybe uranium).
Now is also the perfect time to celebrate the sun and wind and rain.