In the Summer School of MIKROBIOKOSMOS 2022, held in Argalasti Pelion (Greece) from 4-8 July 2022, Dr. P.G. Kougias gave a presentation on the microbial “black box” of anaerobic digestion for bioenergy production. The session was led by the CooCE partner ELGO, involved in deciphering the complex microbial interactions in anaerobic digestion. The Summer School focused on the role of microbiome in ecosystem functioning, food security, human health, and environmental protection, providing a great platform for knowledge exchange and collaboration.