Marine pollution caused a growing trend of aesthetic and functional disturbances in coastal ecosystems with environmental, social and economic impairment, with abrupt acceleration in the 1970s. Within these last 50 years, the over-enrichment of continental runoff by nutrients has emerged as one of the leading causes of water quality impairment, with tremendous losses for ecosystem services, the foundations to sustain the fishery, aquaculture, recreation and tourism. Most of these scenarios are anthropogenically driven eutrophication (ADE). Algal blooms and oxygen depletion are among the symptoms of a problem that characterizes the anthropocene together with other global stressors. Worldwide, one of the most iconic cases of ADE on beaches is the green tides of Ulva spp., such as those occurred in Qingdao beach, China, in 2008 and the most recent Sargassum bloom in central tropical Atlantic, with floating material observed for 8000 km, from Africa to Central America, highlighting the problem to the global audience. In this chapter, we present the magnitude of ocean eutrophication, their causes and consequences to human beings and marine biodiversity, and potential solutions to increase the resilience of marine environments and coastal communities.