What is BECCS and why is it controversial?

• A. BECCS involves converting biomass to energy with no carbon capture.
• B. BECCS is a carbon pricing instrument.
• C. BECCS requires no land use and has no food competition.
• D. BECCS combines bioenergy with CO2 capture and storage to yield negative emissions; controversy includes land-use change, competition with food, and net impact uncertainty.

Answer: (D)

BECCS stands for bioenergy with carbon capture and storage. The core idea is to generate energy from biomass and then capture the CO2 produced, storing it underground so it doesn’t return to the atmosphere. Since the biomass has absorbed CO2 as it grew, capturing and storing the emitted carbon can create a net removal of CO2 from the atmosphere over time when everything works as intended. The controversy comes from real-world complexities: growing the biomass often requires large land areas, which can push out food crops or drive land-use changes that release other emissions; the overall climate impact depends on a full life-cycle accounting—cultivation, processing, transport, capture efficiency, and how permanently the CO2 is stored. Because these factors vary and can offset benefits, BECCS remains debated.