Environment and social acceptance

How does the environment respond to CCS, and in particular to acidification in case of leakages?

In the event of leaks in the reservoirs where CO2 is injected, carbon dioxide can escape as a gas on the seabed. Acidification of the immediate vicinity of leakage sites is the result, but limited to a few tens of metres, as studies in the North Sea have shown. In the small radius of the leakage sites, there could be a decrease in biodiversity.

In the case of the deep-water locations at MAR studied in AIMS3, the situation is different. In reactive oceanic upper crust, bicarbonate or liquid CO2 is stable and also heavier than seawater due to its density. If carbon dioxide is injected into the subsurface in the CCS experiment, it will either be precipitated as carbonate in the pore space, or the liquid CO2 will be stored in the pore space. According to the phase diagram of CO2, both scenarios have almost no risk of possible leakage along pathways. In AIMS3, monitoring devices are nevertheless developed and used to prove that leakage does not occur.

How is public acceptance affected by CDRmare, CCS experiments and knowledge transfer?

AIMS3 is trying to establish social science measures and modern investigation methods to unravel the broader perspective of how CCS methods gain acceptance, with a focus on the German public. This will consist of both broad-based online surveys to gain a picture on a representative sample of the German population as well as more targeted formats to capture detailed insights into the perspectives of population located nearby potential application spots. For example, within the format of Citizen’s Jury Workshops an in-depth understanding of conflicting goals and underlying attitudes will be generated.

An octopus approaches a coral grown on basalt fragments in a water depth of 900 metres at the Mid-Atlantic Ridge, recorded with the diving robot MARUM-QUEST during expedition M128 (Photo: MARUM, University of Bremen)