Zero is the only acceptable leakage rate for geologically stored CO2: an editorial comment

Leakage is one of the main concerns of all parties involved with the development of Carbon Capture and Storage. From an economic point of view, Van der Zwaan and Gerlagh (2009) suggest that CCS remains a valuable option even with CO2 leakage rate as high as of a few % per year. But what is valuable is, ultimately, determined by social preferences and parameters that are beyond economic modeling. Examining the point of view of four stakeholder groups: industry, policy-makers, environmental NGOs and the general public, we conclude that there is a social agreement today: zero is the only acceptable carbon leakage rate.