At Sourceful we conducted a rigorous selection process alongside our scientific advisers to identify which projects to support in Sourceful Climate. You can find out more about this here.
We identified the following three projects as leading examples of frontier technologies that remove carbon dioxide from the atmosphere.
Heirloom marries the natural properties of abundant carbonate minerals with a passive air contactor in a Direct Air Capture system to remove CO2 permanently from the air. These minerals are highly reactive with CO2 at ambient temperature and pressure. They're placed in the air contactor and exposed to ambient air. The CO2 is then extracted, while the mineral is returned to the air contactor to absorb CO2 again. The resulting "looping" process is an affordable, sustainable, low-extraction method to permanently remove CO2 from our atmosphere at scale.
Charm Industrial is leveraging the natural ability of plants to remove carbon dioxide. However, they are hacking the process to ensure it is permanently stored and not re-released. They convert waste biomass (i.e. dead plant matter) into fast pyrolysis bio-oil and inject it deep underground into salt caverns, where it will be safely stored for thousands of years.
greenSand focus on removing CO2 by leveraging a natural weathering process. They utilise the properties of a common mineral called Olivine. The mineral is ground into gravel or sand and used in roads, footpaths and railway lines. The mineral reacts with rain which contains CO2, producing bicarbonate solutions that ultimately lead to the safe storage of carbon in limestone on the seafloor. The reaction is one-sided, and the CO2 is permanently fixed.