Worse Than Fossil Fuels? Why Bioenergy Is Not Green
An Interview with Princeton Research Scholar Tim Searchinger
The fundamental idea behind bioenergy is that it’s carbon-neutral because it releases the carbon that plants absorb when they grow, and thus does not add carbon to the air. Why is this wrong?
It’s a common misunderstanding. Burning biomass of course emits carbon, just like burning fossil fuels. The assumption is that the plant growth to produce that biomass offsets the emissions. But the first requirement for a valid offset, whether for carbon or anything else, is that it is additional. If your employer wants to offset your overtime with vacation, they have to give you additional vacation, not just count the vacation you’ve already earned. Similarly, you can’t count plant growth as an offset if it was occurring anyway. Plant growth can only offset energy emissions if it is additional. Counting plants that would grow anyway is a form of double-counting.