Chapter 1. Introduction: Environmental Pollution and Biotechnological Solutions -- Chapter 2. Bioremediation Using Microalgae and Cyanobacteria and Biomass Production -- Chapter 3. Removal of Heavy Metals and Organic Pollutants by Marine Microalgae -- Chapter 4. Algal-Bacterial Consortiums, from Fundamental Interactions to Environmental Applications -- Chapter 5. Biodegradation of Environmental Pollutants by Marine Yeasts -- Chapter 6. Sustainable Direct Digital Manufacturing Using Marine Resources -- Chapter 7. Exploiting Marine Fungi in the Removal of Hazardous Pollutants and Biomass Valorisation -- Chapter 8. Marine Bacteria for Bioremediation -- Chapter 9. Marine Bacteria for Biofertilizers -- Chapter 10. Marine Sponges for Bioremediation Purposes and for Secondary Metabolites Production -- Chapter 11. Genetic Modification: A Gateway to Stimulate the Industrial Production of Biofuels -- Chapter 12. "Omics" Technologies in Biodegradation Processes -- Chapter 13. Conclusion: Environmental Protection ‒ Our Common Responsibility.