Seagrasses are an often overlooked but vital part of the seascape. While they have been described as the "lungs" and "ecosystem engineers" of the sea, their contributions to planetary health and human well-being are not as well-known as those of other marine ecosystems, such as coral reefs and mangroves. To overcome this "charisma gap", the United Nations report "Out of the blue: The value of seagrasses to the environment and to people" synthesizes current knowledge of seagrass ecosystems, highlights the many values they provide to people, and offers policy recommendations that fully meet these values. Dr. Dimitris Poursanidis member of the Remote Sensing lab of IACM-FORTH has coordinated Chapter 2 entitled " Seagrass mapping and monitoring"