Capturing CO2 from bioenergy applications (e.g. ethanol production or burning biomass for electricity) and subsequently sequestering that CO2 through either CCS or CCUS. The theory is that BECCS is “carbon negative” because bioenergy is theoretically “carbon neutral,” based on the idea that plants will regrow to fix the carbon that has been emitted. Many critics say this overlooks emissions from land use change and life cycle emissions.