Climate change is a well-known problem. Current political solutions are mainly based on an all-electric, hydrogen, and zero carbon society. It means stopping use of fossil resources like oil and gas. However, we cannot live without carbon, since it is a fundamental element in our daily life. (Textile fibers, plastics, fertilizer,….etc.) The challenge now is to integrate the carbon in a circular economy that can respond to our societal needs, and to mitigate its quantity in the atmosphere. While waiting for nuclear fusion, we shall continue to emit CO2 in order to produce the electricity we need. Green electricity is very useful, but will not suffice due to its intermittency. Moreover, a big part of our industry depends today on carbo-chemistry. Therefore, we shall need quickly a circular source of carbon in order to stop progressively to use fossil resources.

Over the last few years, there have been different initiatives to develop DAC technologies. (CO2 Direct Air Capture). At the beginning, CCS (Carbon Capture Storage) was the solution pushed forward, now we see that CCU (Carbon Capture Utilization) is becoming a preferred solution. For instance, captured CO2 combined with Hydrogen leads to the production of synthetic fuel that is the retained solution for the future of aviation.

DAC technologies, as developed today, are too expensive. However it is possible to develop small DAC units to be integrated in buildings of a certain size. (Office, shopping mall,….)

The order of magnitude for a 3000 m2 building is 45 T CO2/year. It reduces the building carbon footprint, and it is sufficient to produce synthetic fuel (methanol)for heating in winter time. The power of this idea is to multiply the concept over millions of building around the world with a tremendous multiplying effect, with direct positive consequences on climate change and the energy transition.

The attached schematic is showing how the BICC system can be integrated within the different technical systems of a modern building with integrated renewable energy production.