I've just watched a very thought provoking video with a geologist talking about coal. It seems (no pun intended) that coal was laid down from 360 million years ago.... and then ceased being produced at about 300 million years ago. Why? When trees first grew and died, there was no biological mechanism to decompose the cellular structure of the trees. So it remained..... and became coal. Then after a long period, mechanisms developed that could break down the tree cells...... so there were no longer any un-decomposed trees that could become coal.
This of course means that the earth's resources of coal are finite..... and can't be replaced.
...... and the same for the fossil fuels that power much of our life.
We must go solar.
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