Why biomass isn't a fossil fuel
Biomass and fossil fuels differ mostly in age. Yes, they are both formed from once-living matter, but the organisms that form fossil fuels lived and absorbed carbon millions of years ago under different environmental conditions.
When fossil fuels are burned, the carbon is released into the atmosphere, but it takes millions of years to be re-absorbed and form new fossil fuels. This means that fossil fuels are adding more carbon to the atmosphere than what is being removed.
Because biomass has a shorter lifecycle, the carbon released when it’s burned is the same amount absorbed during its lifetime.2 The process of producing (growing, harvesting) and converting the biomass does not produce any extra carbon dioxide. This is known as a closed carbon loop and qualifies biomass as a carbon-neutral energy source.