In the framework of Action 2.1 "Data from aquatic (marine and terrestrial) ecosystems related to climate change", the Photo-Catalytic Processes and Environmental Chemistry group of the Institute of Nanoscience and Nanotechnology of the National Centre for Scientific Research "Demokritos", focused on the study of the history of harmful algal blooms in aquatic ecosystems of Greece. One of the effects of climate change is the more frequent occurrence of harmful algal blooms in surface waters, which are mainly favored by the global warming, the eutrophicatio...