Which statement best describes the potential land-use concerns associated with large-scale BECCS deployment?

• A. BECCS may compete with food production and raise land-use concerns; its net impact is uncertain.
• B. BECCS has no land-use impact.
• C. BECCS eliminates all land-use concerns.
• D. BECCS is always cheaper than alternative mitigation.

Answer: (A)

The key idea here is how land is used when we scale up BECCS. BECCS relies on growing biomass for energy, and then capturing and storing the carbon emitted during conversion. To do this at large scale, you need a lot of land to grow the biomass feedstock. That creates land-use concerns because the land used for energy crops can compete with land for food, pasture, forests, and natural ecosystems. If food crops or habitats are displaced, you can affect food security, prices, biodiversity, and water and fertilizer needs. There are also potential indirect land-use changes, where expanding bioenergy to meet energy needs causes other lands (often forests or croplands elsewhere) to be converted, which can release additional carbon.

Whether BECCS actually provides a net reduction in atmospheric CO2 depends on many variables: the type and yield of feedstock, farming practices, land management, the efficiency of the energy conversion and capture process, and how carbon is stored and for how long. If land-use change emissions or cultivation emissions are high, they can offset part of the CO2 captured, making the net impact uncertain. Because these factors vary by region, policy, and technology, the overall net effect is not guaranteed, which is why this option best describes the potential land-use concerns and the uncertainty around BECCS outcomes.