Marble ethanol fireplace manufacturers tell you that this plant-derived fuel is made by fermenting sugars from corn, potatoes, and cellulose, and is considered a "clean fuel." It doesn't contain dangerous chemicals, and in some cases, it's made from forestry by-products such as wood pulp and sawdust.

By burning cleanly and efficiently, ethanol fuel for ethanol fireplaces produces only small amounts of carbon dioxide and water as byproducts.
Are alcohol fireplaces safe? Marble ethanol fireplace manufacturers tell you that alcohol fireplaces that are used correctly are safe. Its fuel, biomass ethanol, is flammable. The way you pour it into the fireplace for refueling can cause a spill. Should this occur, the spilled material could pose an unexpected safety hazard.
The flame generated by the marble ethanol fireplace consumes oxygen and produces carbon dioxide. For most rooms, this is perfectly acceptable. But avoid placing an alcohol fireplace with a high BTU index in a small space as it may produce too much carbon dioxide to be safe.
Marble ethanol fireplace's biomass ethanol fuel itself produces a stable flame without sparks or smoke or ash. Be sure to follow all instructions on the ethanol fireplace itself, add fuel, and extinguish the flame to avoid potential burns or other hazards.