Yes, and most of our coal dates back to a time period before cellulose could be digested. An organism then evolved the capability to digest cellulose, and destroyed that type of environmental possibility for all time, into earthly perpetuity. I'd say that's a bigger ecological devastation than we'll ever accomplish.
That theory is heavily debated, the initial sequestration of carbon that allowed for an oxygen atmosphere is predates cellulose. Which suggests an inability to digest cellulose isn’t necessary to explain vast coal deposits which formed far more recently.
https://www.nationalgeographic.com/science/article/the-fanta...