oligotrophic Lake Ohrid from increased pollution. Indeed, sediment cores show a ~3.5 fold increase in phosphorus concentration over the past century. On the one hand, shifts from endemic to common European species, which are better adapted to higher nutrient conditions, have already been observed close to polluted inflows. On the other hand, higher nutrient levels have reduced the water transparency, as well as the oxygen availability in the deep water and at the lake bottom, two properties which are requisite for the endemic flora and fauna. Still, the lake is in a comparably good state at the moment. However it may take more than a decade to see the effects of today's pollution level in the lake, because of its long water residence time. Moreover, it was shown that the negative effects from eutrophication would be significantly amplified by global warming. Although there is time to react, computer simulations indicate that at least a 50% reduction in phosphorus input must be reached to keep the deep water oxygenated for the next 50 years at predicted atmospheric warming. This aim could be reached by controlling household wastewater, which is by far the biggest phosphorus source at the moment. First steps in that direction have been taken by extending and improving the existing sewage system in North Macedonia in the framework of a GEF (Global Environment Facility) program. The most important next task would be a solution for three remaining, severely polluted tributaries, one in North Macedonia and two in Albania. Declaration on the Protection of the Lake Ohrid Ecosystem On 3 May 2018, the Society of Wetland Scientists released the Declaration on the Protection of the Lake Ohrid Ecosystem, which was passed unanimously by 45 attending members at its 13th annual Europe meeting. Urging Macedonian authorities to substantially enhance protection of Lake Ohrid, the declaration outlines the unique significance of the interconnected Ohrid-Prespa lake system, both for its biodiversity and relevance to research on climate and evolution, and recommends measures for future management including revitalization and enlargement of wetland areas, pollution control and a re-orientation of tourism policy. It further describes the "critical importance" of the last intact marsh on the Lake Ohrid shore, Studenchishte Marsh, in terms of its species composition and ecosystem services such as water quality improvement, carbon storage and flood retention among others. Namesakes Lake Ohrid is also the namesake of Ohrid Lacus, a hydrocarbon lake on