Progress on biodegradation of stone monuments: Editorial on special issue for European Conference on biodegradation of Stone Monument 2020 (VSI-ECBSM2020)

•Deterioration and degradation linked to living microorganisms are one of the major sources of alteration of stone monuments.•The ECBSM conference is an opportunity to gather researchers, restorers, industrial experts, and teachers.•This special issue consists of 18 selected papers presented at the 4th ECBSM in 2020.