Developed by the so-called Blue Growth Community, which consists of several EU-funded project, the Guidelines for the sustainability of cruising and recreational boating in the Mediterranean were presented. Five major challenges have been identified for both sectors: 1) Eliminating atmospheric emissions of pollutants and greenhouse gases; 2) Safeguarding ecosystems and biodiversity; 3) Eliminating water pollution (chemical, organic, wastewater effluents), preventing waste generation and improving waste management; 4) Boosting knowledge and innovation; and 5) Avoiding the…