Bubbles could block a promising technology that would separate carbon dioxide from industrial emissions, capturing the greenhouse gas before it contributes to climate change. A team of researchers with backing from the Department of Energy’s Exascale Computing Project (ECP) is out to burst the barrier, using a code that captures the floating blisters and provides insights to deter them. Chemical looping reactors (CLRs) combine fuels such as methane with oxygen from metal oxide particles before combustion. The reaction produces water vapor and carbon dioxide, which can easily be separated to create a pure CO2 stream for sequestration or industrial use. Standard post-combustion separation must pull carbon dioxide from a multigas mixture.