The ONE EARTH project demonstrates an innovative climate-friendly solution: using CO₂-rich gases from fermentation as an input for microalgae cultivation. Instead of releasing greenhouse gases into the atmosphere, the CO₂ is “fed” to algae, which then produce polyunsaturated fatty acids, such as omega-3. These can be extracted for use in nutraceuticals, foods, or aquaculture feed.
This approach addresses two challenges simultaneously, it reduces industrial CO₂ emissions and creates a sustainable source of omega-3 oils. EU research has already proven the feasibility of such “CO₂ algae biorefineries.” For example, the D-Factory project successfully cultivated microalgae using captured flue gas CO₂ to produce carotenoids and other high-value compounds.
Microalgae biotechnology is recognised as a promising method to conserve resources, cut carbon emissions, and produce essential nutrients sustainably. By replacing traditional fish oil, which is derived from wild fish, with algae-based omega-3, this innovation also helps relieve pressure on ocean ecosystems.
The process supports EU climate objectives under the European Green Deal by turning waste CO₂ into marketable products, contributing to carbon reuse and circular industrial processes. Using microalgae to capture carbon and generate omega-3 exemplifies how ONE EARTH fosters a sustainable and “self-reinforcing” carbon cycle between industry and nature.