Why is wood renewable but coal non-renewable?

Mostly because of the amount of time it takes for the used coal or wood to regenerate. Coal takes thousands of years to form, meaning there is a finite amount of it available. read more

If we have wood in sufficient amount then we can make coal by partially burning of wood or burning of wood in the limited amount of oxygen. That's why the wood is renewable and coal is non-renewable. read more

Coal is considered a non-renewable resource because the earth cannot replenish it. Geologic heat and pressure work on organic decomposing materials to create coal. This process takes millions of years. read more

Coal is NON-renewable because after we dig it all up and burn it, then it's gone, finished. There is no more. It doesn't renew itself every day. Sunlight, wind power, wave and tidal motion and geothermal power are all renewable, because we can use them all as much as we can today, and they still come back again, renewed tomorrow. read more