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Bonus points for articles or links to said facts. I demand rabbit-holes to explore
About 360 million years ago, trees had evolved lignin and cellulose, allowing them to get big. However, no bacteria that could digest these woody substances had yet evolved. In fact, those bacteria would take another 60 million years to arrive. All this time huge trees kept growing, crashing into the swampy ground, and piling up on top of uncounted other trees, getting buried deeper and deeper into the ground. Over millions of years, subjected to the heat and pressure of deep burial, the carbon in these trees was converted into the fossil fuels we know and love today – coal, oil, and natural gas. All the fossil fuels we use were produced during this 60-million year period. Source
About 360 million years ago, trees had evolved lignin and cellulose, allowing them to get big. However, no bacteria that could digest these woody substances had yet evolved. In fact, those bacteria would take another 60 million years to arrive. All this time huge trees kept growing, crashing into the swampy ground, and piling up on top of uncounted other trees, getting buried deeper and deeper into the ground. Over millions of years, subjected to the heat and pressure of deep burial, the carbon in these trees was converted into the fossil fuels we know and love today – coal, oil, and natural gas. All the fossil fuels we use were produced during this 60-million year period.
Source
It all wasn’t swampy. What about upland ecosites? Imagine the wall of dead trees.