The image demonstrates several CO2 Capture pathways - post-combustion capture, pre-combustion capture, and oxy-fuel combustion. In all processes, near zero emissions can be achieved by removing the CO2, though at different steps in the process. Once removed, the CO2 can be compressed and transported to suitable storage.
The schematic shows the oxy-fuel combustion process where fuel (e.g. coal) is burned in a boiler with an oxygen-enriched gas mixture. Once filtered and condensed, the resulting flue gas enters the CO2 capture and compression unit where the CO2 is captured and compressed for transportation to a suitable storage location.