The Mediterranean Sea Basin as a Single Ecosystem: Problems and Prospects for International Cooperation

The article justifies that the Mediterranean Basin in the broad sense (Mediterranean, Black, Azov and Marmara Seas) is a single ecosystem. The state of this ecosystem is affected by the rivers of this water intake basin, among them — the Nile, Tiber, Po, Rhone, Ebro, Danube, Don and others. The interconnection of the individual elements of the ecosystem is ensured through active water exchange and a sufficiently branched system of currents that turn the inland seas of the Mediterranean basin into communicating vessels. The paper analyzes the main anthropogenic factors, as well as the influence of climate changes on the ecological condition of the Mediterranean ecosystem. Within the framework of anthropogenic impact, special attention is paid to the negative impact of urbanization, the oil industry (production, transportation and oil refining), industrial and agricultural waste, as well as runoff waters. The problem of plastic, as well as contamination with dichlorodiphenyltrichloroethane (DDT) is discussed in detail. Analysis of DDT accumulations in the bottom sediments of the Mediterranean basin makes it possible to study the synchronization of anthropogenic processes and their long-term nature. Aridization (intensification of droughts) in the Mediterranean is shown as an important problem for the regional ecology, not directly related to the anthropogenic factor. The article reveals the disastrous effects of increasing droughts and climate change on Mediterranean basin countries. International cooperation to regulate transboundary environmental problems in the region is associated with a number of problems. Among them is the delimitation of sea zones between countries, first of all — the territorial claims of Turkey in the Eastern Mediterranean. The problem of the shelf around the Serpents’ Island in the Black Sea is also considered, as well as territorial disputes in the Western Mediterranean (France/Spain). The paper widely presents successful cases of cross-boundary cooperation: the 1976 RAMOGE Agreement, the 1975 Mediterranean Action Plan and the 1995 Barcelona Convention, as well as its seven protocols. The cases of PEGASO and 4GreenInn projects, as well as the BSEC environmental projects, are considered as successful examples of cross-border academic cooperation. Promising areas of cooperation are outlined and the conclusion is made about the importance of transboundary environmental risk management, despite the political differences between the Mediterranean countries and the EU sanctions restrictions on Russia after 2014.


Introduction
The Mediterranean basin is a single ecosystem, the elements of which are interconnected. This concerns both the direct anthropogenic impact (pollution of coastal areas and sea waters with industrial and agricultural waste), and the influence of natural and climatic factors, including an increase in average temperature and a decrease in precipitation, leading to aridization of the region and a shortage of fresh water. A number of Mediterranean countries are taking some measures at the national and regional levels, but they are not enough to solve urgent environmental problems. Despite the existing contradictions and political differences, international cooperation between the countries of the region is an urgent necessity. There are a number of successful cross-border cooperation projects, the experience of which is also analyzed in this paper.
The methodology of this article is interdisciplinary, combining both natural science and social science approaches. The team of authors includes researchers of marine ecosystems (A.O. Kovalevsky Institute of Biology of the Southern Seas), a specialist in climate change (Sevastopol State University), as well as a leading expert on international political and international legal issues in the Mediterranean basin. Combining their efforts made it possible to reach a qualitatively new level of studying the problems of transboundary cooperation in the field of environmental protection.

The Mediterranean Sea Basin as a Single Ecosystem
The Mediterranean Sea has an area of 2,500,000 km 2 and a maximum depth of 5,121 m. Such large rivers as the Nile, Tiber, Po, Rhone, and Ebro flow into it, and the boundaries of the water intake basin run through the Pyrenees, the Alps, the mountains of the Balkan Peninsula, the Atlas Mountains, the Taurus, Zagros, Lebanon, and others. The linear dimensions of the sea are estimated at 3700-3750 km from west to east and 1200-1800 km from north to south.
The ecosystem of the Mediterranean Sea can be conventionally divided into two large partsthe Western Mediterranean and the Eastern Mediterranean ( Fig. 1), each of which, in turn, includes a number of inland seas.
In the Western subsystem, these are the Alboran Sea (between Spain and Morocco), the Balearic Sea (between Spain and the Balearic Islands), the Ligurian Sea (between Italy and Corsica) and the Tyrrhenian Sea (between the Apennine Peninsula, Sardinia and Sicily). In the Eastern subsystem, these are the Adriatic Sea (between Italy and the former republics of Yugoslavia), the Ionian Sea (between Greece and
Sicily), and the Aegean Sea (between Greece and Turkey). Within the Eastern subsystem, one can also distinguish the Libyan Sea (northeast of Libya), the Levantine Sea (eastern part of the Mediterranean), and divide the Aegean Sea into a number of inland seas (Cretan, Myrtoi, etc.).
In a number of studies, the Mediterranean Sea basin is considered in a broad contexttogether with the Black Sea basin, which also belongs to the Atlantic drainage basin. In this case, the Black Sea, the Sea of Azov and the Sea of Marmara also belong to the ecosystem of the Mediterranean Sea in a broad sense. The interaction of the Black and Mediterranean Sea basins is gaining particular relevance in the context of Turkey's construction of the artificial shipping channel "Istanbul," which has been under way since June 2021. 1 In geopolitics, the Red Sea basin is also sometimes referred to as the Greater 1 A $15bn New Canal for Istanbul // The Economist. October 9, 2021. URL: https://www.economist.com/ europe/2021/10/09/a-15bn-new-canal-for-istanbul (accessed: 15.11.2021).
Mediterranean (Aghazada, 2021, p. 432), but this inland sea of the Indian Ocean and its coast belongs to a different drainage basin. On the other hand, the Nile River Basin, which covers a large part of Northeast Africa, is closely linked to the Mediterranean ecosystem.
Water exchange between the seas of the Mediterranean basin is provided by a fairly extensive system of currents (Fig. 1). Their speed in the open parts of the sea is 0.5-1.0 km h-1, and in the straits it can increase to 2-4 km h-1. Even with an average speed of currents of 1 km h-1, the water exchange of surface waters of the sea can occur on less than a half-year time scale. It is obvious that the seas of the Mediterranean basin are communicating vessels and ecologically significant processes of migration of pollution in their waters take place on the same time scale. Therefore, a negative mutual influence of economic zones of different countries of the Mediterranean basin is possible. If the southern coast of the Mediterranean Sea is dominated by the desert cover due to the extremely arid climate, then on the northern coast there are also deciduous forests (Fig. 2).
The coastal areas together with the system of inland seas form a single ecosystem of the Mediterranean Sea.

Transboundary Environmental Problems in the Mediterranean
The Mediterranean ecosystem is characterized by a number of problems related to pollution of both coastal areas and seawater. Coastal areas, especially those near the mouths of rivers, are the most polluted. The causes of pollution are most often industrial waste, untreated municipal wastewater, agricultural pollution, as well as excessive anthropogenic load associated with active tourism and intensive, often chaotic development of the coastal zone.
Part of the Mediterranean Sea is polluted with oil, for example, off the coast of Libya, where oil is extracted on an industrial scale. The largest oil refineries in France are located on the Mediterranean coast near Marseille. One of the large-scale oil pollution occurred in February 2021 off the coast of Lebanon and Israel, which led to serious damage to the environment, as well as the temporary closure of all Israeli beaches. 2 The impact of the anthropogenic factor is intensified by urbanization -a number of capitals and major cities are located on the Mediterranean coast, such as Barcelona, Marseille, Rome, Algiers, Tunis, Tripoli, Athens, Tel Aviv, Alexandria and others (Fig. 3).
Urban agglomerations are powerful sources of air emissions, including sulfur dioxide, as well as polluting seawater through runoff. The problem is particularly acute in the threemillionth Rome. On the Turkish coast, due to the large amount of waste water, there is a phenomenon called "red tides" -the spread of toxic microflora occurring in water rich in phosphorus and nitrogen. 3 2 Rinat Z., Zikri A. Oil Spill off Israel's Coast Is Its Worst Maritime Pollution in Decades, and Cleanup "Could Take Years"// Haaretz. February 19, 2021. URL: https://www.haaretz.com/israel-news/.premium-oil-spilloff-israel-s-coast-is-its-worst-maritime-pollution-indecades-1.9553528 (accessed: 15.11.2021).

Fig. 3. Largest cities on the Mediterranean coast
Source: (Milano et al. 2013, p. 500). A separate problem is plastic, 0.57 million tons of which annually enter the Mediterranean Sea (out of 24 million produced in the region). The strong tourist flow increases pollution by one-third. 20 % of plastic enters the water from merchant ships and fishing boats, as the Mediterranean is a zone of active shipping. In general, plastic has an extremely negative impact on marine flora and fauna. 4 The largest emissions of plastic into the water area occur on the southwest coast of Turkey, in the agglomerations of Barcelona, Tel Aviv, in the Po delta (Italy), Valencia, Algiers, etc. (Fig. 4).
The analysis of spreading of the most ecologically dangerous chlorinated hydrocarbons, DDT, in bottom sediments is a vivid example illustrating all harmfulness of transboundary sea water pollution in the long term, as well as https://www.hurriyetdailynews.com/red-tide-poses-riskfor-sea-ecosystem-45663 (accessed: 15.11.2021 synchronization of anthropogenic processes occurring within a single ecosystem of the Mediterranean basin. The introduction of dichlorodiphenyltrichloroethane, or DDT, to combat insect pests that destroy agricultural crops and also carry deadly diseases, revolutionized agricultural production and medicine. The use of DDT contributed to the elimination of malaria and typhus in the United States and Europe. DDT was widely used against vectors of these diseases from World War II through the 1960s. It is estimated that global production and use of DDT exceeded 4,500,000 tons in 1948-1993(Li & Macdonald, 2005. Gradually, it became clear that the widespread distribution of DDT, its relatively high fugacity and properties such as persistence and lipophilicity, led to the fact that traces of DDT appeared in all areas of the world, even the most inaccessible for humans. By the end of the 1960s, the toxic properties of DDT had been identified not only for insects, but also for animals of higher links of the trophic chain and for humans (Beard, 2006). DDT was banned in most Western European countries. Some states in the Eastern Mediterranean (Cyprus, Egypt, Israel, Libya, and Turkey) have not used chlorinated pesticides since 1985 (Li & Macdonald, 2005). In 2001, the International Stockholm Convention was adopted to reduce the production and eliminate emissions of already produced persistent organic pollutants, the original list of which included DDT. 5 Despite the potential danger of DDT to the environment and human health, its use is permitted in circumstances where the benefits of its use outweigh the associated risk. Thus, DDT was widely used in the African continent to combat malaria at the beginning of the 21st century, since there are still no effective alternatives (Ranson et al., 2011). Moreover, at the WHO level, the need for DDT use on a large scale in the face of climate change and possible outbreaks of insect-borne diseases is now being re-justified (Mandavilli, 2006). In China, technical DDT is still used as an additive in nonfouling paints for fishing boats (Xu et al., 2013). In these circumstances, the problem of DDT pollution of the environment currently refers to the phenomena, the elimination or minimization of negative consequences from which require the development of international agreements both at the global and regional levels.
The sources of DDT entering marine ecosystems are river and storm terrigenous runoff, releases of untreated municipal wastewater, aerosol atmospheric fallout, rain and snowfall, dumping, discharges from ships, as well as exchange of water masses with neighboring seas. Due to its high hydrophobicity and adhesive properties, DDT in water binds to suspended particles and is transported with them over long distances or partially removed from the water into bottom sediments, where it can accumulate in large quantities over time. During remobilization of bottom sediments, the DDT buried in them can re-enter the aquatic ecosystem and its food chain, therefore, data on their content in sediments are important for predicting the levels of pollution of water bodies during planned hydraulic works and possible emergency events. In addition, data on the state of bottom sediments are the most important source of retrospective information on the history of ecosystems of water bodies, since the composition of the soil strata makes it possible to assess the processes taking place at the time of their formation and development, including the chronology of accumulation of pollutants.
An overview of DDT content in bottom sediments from different regions of the Mediterranean Sea is presented in Table 1. Hereinafter, DDT means the sum of concentrations of the original pesticide DDT and its metabolic products, DDE (dichlorodiphenyldichloroethylene) and DDD (dichlorodiphenyldichloroethane), the first of which is even more toxic than DDT.  (Galanopoulou et al., 2005) Source: compiled by the authors.
The data presented in the table show that the differences in DDT levels reflected different degrees of agricultural industrialization, population density, and the impact of industrial and urban waste on pollution in the coastal and marine areas of the Mediterranean basin. Therefore, data on the distribution of DDT in bottom sediments can be recommended as a basis for the development of international agreements on the regulation of permissible discharges into the environment in various economic zones of the Mediterranean basin in the future.

Aridization as a Regional Problem
In addition to the direct anthropogenic factor, the Mediterranean ecosystem is also affected by other transboundary problems, some of which are related to natural and climatic changes. One of the main consequences of the current global climate change for the Mediterranean countries, along with the rise in temperature, is the intensification of droughts. This affects both the increase in dryland area and the duration of droughts.
If now the arid areas here on average account for less than 30 %, after a global warming of 3 o C their area will be 50 %.
According to forecasts made by the Intergovernmental Panel on Climate Change (IPCC) based on climate change calculations using climate models, it is the Mediterranean countries that will be most affected by droughts in the coming years. 6 This can be clearly seen in the Palmer Drought Severity Index (PDSI) projection map in 20 years, shown in Figure 5.
It should be noted that we are talking about the coming decades, not about climate change in the distant future. Moreover, the process of increasing drought in the Mediterranean countries is already underway. And this is not just another increase in drought with its subsequent rapid easing. A study of the width of annual tree rings, carried out by NASA specialists, showed that the drought in the Mediterranean countries in 1998-2012 was 50 % more severe than all droughts in the last 500 years. In this case, cuts of trees from Spain, Italy, France, from the countries of North Africa and the Mediterranean coast of the Middle East were used (Cook et al., 2016).
The most difficult situation is in the countries, where along with a high value of the 6 Kokorin A.O. Climate Change: Review of the Fifth Assessment Report of the IPCC. Moscow: World Wildlife Fund (WWF), 2014. P. 52.
drought index there is a lack of water resources. Thirteen countries/territories of the Mediterranean basin (i.e. more than one third) are among the top-33 countries with the greatest water shortage in 2040, including (in descending order of problem severity) San Marino, Palestine, Israel, Jordan, Libya, Macedonia, Morocco, Syria, Turkey, Greece, Algeria, Spain and Tunisia. 7 Drought was one of the causes of the Arab Spring in Tunisia, Libya, Egypt and several other countries in the region (Johnstone & Mazo, 2011). In particular, the severe drought in Syria from 2006-2011 led to water shortages and poor harvests for several years, which, in turn, caused food shortages, unemployment, and increased social tensions. This subsequently led to civil war and migration from Syria (de Châtel, 2014).
The worst drought in 150 years was in Spain in 2014, when the country was close to a complete depletion of drinking water resources. 8 In addition to water shortages, the dangers of droughts in the Mediterranean include forest fires, significant overconsumption of electricity for air conditioning, and loss of life. For example, during the abnormally hot summer of 2003 in Europe, 70 thousand people died from heat waves, with 15,000 in France in August alone (Fink et al., 2004). In recent years, droughts have also led to numerous fires in southern Europe, and the forests in France, Spain, and Portugal were on fire.
According to the forecasts of climatologists, the duration of heat-waves in southern Europe will increase, and by the end of the century they will be two months longer. According to the estimates of the Max Planck Institute in the Middle East countries already by 2050 the temperature in the summer even at night will not drop below 30 °C, and at noon it will reach 46 °C. In this regard, by 2050 the number of climate refugees will reach 250 million people. Agriculture is particularly affected by droughts in the Mediterranean. During the three-year drought from 2017-2020, it killed 50 to 70 % of the harvest of olives and grapes, which led to an increase in the price of olive oil in January 2021 in Italy by 44 % compared to the previous year. The corresponding damage in Italy alone is estimated at 2 billion euros. And Italy and Spain are the main producers of olives. Vineyards in southern Europe are also severely damaged by droughts. In fact, agricultural lands in southern Europe are turning into a zone of risky farming (Rodrigo-Comino et al., 2021).
Increased droughts in the region also leads to changes in river flows and, consequently, in the regime of filling of reservoirs. In the Mediterranean river basins, spring floods are becoming weaker due to shorter winters and higher temperatures. On the other hand, the role of Mediterranean cyclones in increasing summer precipitation increases due to rising water temperatures in the Mediterranean Sea. In Europe, river runoff decreases from north to south and from west to east, so that the most difficult situation in this regard is in the Eastern Mediterranean. Construction of new and reconstruction of existing reservoirs is one of the ways to combat water shortages due to uneven precipitation. The use of bottled water is also on the rise in the region. 9 Droughts are usually associated with high temperatures, that is, heat waves. However, although related, these are different phenomena. The severity of a soil drought is usually determined not by air or soil temperature, but by the duration of the drought. Thus, severe droughts include situations when more than four consecutive dry decades are observed without interruption. And if by the increase in the maximum air temperature the Mediterranean countries practically do not stand out among other countries of mainland Europe (Fig. 6a), then by the increase in the duration of droughts they stand out significantly. 9 The Impact of Draught on Drinking Water // EarEau Briefing Note. July, 2020. URL: https://www.eureau.org/ resources/briefing-notes/5111-briefing-note-on-the-impactof-drought-on-drinking-water/file (accessed: 15.11.2021).  For comparison, Fig. 6b shows a similar map for the Middle East, which shows that the increase in maximum temperatures on the hottest days in North Africa is significantly lower, while the Mediterranean countries also fall into the zone of increasing drought. It is the superimposing of heat waves on drought that becomes characteristic of the region. In this case, on the one hand, evapotranspiration increases, which intensifies drought, and, on the other hand, the lack of moisture does not allow lowering the high temperature through evaporation and transpiration.

Problematic Aspects of International Cooperation
The Mediterranean ecosystem is territorially divided between 21 countries. These are Spain, France, Italy, Monaco, Malta, Slovenia, Croatia, Bosnia and Herzegovina, Montenegro, Albania, Greece, Cyprus, Turkey, Syria, Lebanon, Israel, Egypt, Libya, Tunisia, Algeria and Morocco (Fig. 3). A number of other countries are located in the Black Sea basin: in addition to the already mentioned Turkey, these are the Russian Federation, Ukraine, Bulgaria, Romania, Georgia, Abkhazia, and Moldova near the mouth of the Danube. Each party has its own foreign policy interests, the result of which leads to the formation of a regional balance of power (Irkhin & Moskalenko, 2020).
There is intense competition between countries in the use of natural and climatic resources (fishing, tourism). Problems in one country's tourism industry, including environmental disasters, are seen as unique opportunities to lure tourists from another country. There are no plans for the joint development and use of fragile transboundary ecosystems (Berzi & Ariza, 2018).
A separate acute problem is the territorial disputes between the states. The problem of Turkish territorial claims in the Eastern Mediterranean has already been discussed in detail on the pages of this magazine (Gudev, 2021). A more detailed analysis of maritime disputes is presented in the classic monograph by W. Prescott and C. Schofield (Schofield & Prescott, 2005), as well as on a specialized portal. 10 A thorough analysis of all major maritime disputes in the Mediterranean Sea is not the subject of this article. It is rather an illustration of the negative impact of this factor on regional cross-border cooperation.
The Turkish claims in the Eastern Mediterranean are perhaps the most extensive territorial disputes in the Mediterranean basin (Fig. 7).
The problem of territorial claims in the Eastern Mediterranean is exacerbated by the discovery in the 2000s of large offshore natural gas deposits, as well as plans to build the East Mediterranean Gas Pipeline (East Med).
In the Eastern Mediterranean, there are also unresolved maritime disputes between Turkey and the Republic of Cyprus over maritime zones, between Palestine and Israel and Egypt; between Israel and Lebanon; between Syria and Turkey (the borders are not delimited). 10 Boundaries // Sovereign Limits. URL: https://sovereignlimits.com/boundaries (accessed: 15.11.2021).
There is also a difficult situation in the Black Sea -in the waters around the Republic of Crimea, whose accession to the Russian Federation has led to the de facto need to delimit maritime spaces with both Ukraine and Romania, to confirm the maritime border with Turkey. Moreover, there is the water area of the Republic of Abkhazia, which is not recognized by Georgia.
In 2004 This case is one of the successful examples of settling this kind of disputes, in which the Romanian received predominant benefits.
In the Western Mediterranean, a dispute can be distinguished between Spain and Morocco over separate coastal territories and islands, between Spain and Great Britain over Gibraltar (exacerbated in the context of Brexit), between Albania and Greece, as well as between Spain and France (Fig. 8). Let us dwell on the latter in a little more detail, since it just illustrates the impact on the development of cross-border cooperation in the environmental sphere.
Since the 1970s, France and Spain have different views on the maritime borders between them in the Gulf of Lyon. This complicates concerted action to form protected areas, one of which, the Gulf of Lyon Natural Marine Park, is partially located in the disputed marine zone and has been undergoing institutionalization since 2008 (Berzi & Ariza, 2018, pp. 480-482). Political cataclysms also have a strong negative impact on cross-border cooperation. In particular, the European Union, whose members are almost all countries located on the northern shore of the Mediterranean Sea (except for the former republics of Yugoslavia) after the Crimean and Ukrainian events of 2014 curtailed a number of joint programs, including in the scientific sphere, with Russian organizations, especially those located in the territory of the Republic of Crimea. In previous years, this cooperation was quite successful, as will be discussed below.

Successful Examples of Transboundary Cooperation
One of the first successful examples of transboundary cooperation in the Mediterranean Sea is the RAMOGE Agreement signed in May 1976 between France, Monaco and Italy on joint environmental activities in the coastal experimental zone. The agreement was named after the first letters of three cities: Saint Raphael (RA), Monaco (MO) and Genoa (GE), but later the zone was extended to Marseille (France) and La Spezia (Italy). The agreement provides for interaction in the scientific, technical, legal and administrative spheres. If at the first stage (before 1990) mainly joint researches were carried out, since 1990 a number of joint practical actions in the field of ecology was implemented. The working bodies are a committee, a technical committee and working groups. 12 The 53rd session on the implementation of the RAMOGE agreement was held in Monaco in January 2021. It discussed the creation of the brand "RAMOGE" for sustainable yachting and looked at the prospects for collaboration with other transboundary protected areas, including the Park of Lyons (France -Spain) and the Algeria -Morocco -Tunisia trilateral agreement. Participants also discussed the creation of textbooks for high school students on the need to conserve the sea depths using data from joint RAMOGE studies. The participants also discussed the issue of creating textbooks for 12 The RAMOGE Agreement // International Atomic Energy Agency. 1998. URL: https://inis.iaea.org/search/ search.aspx?orig_q=RN:30039024 (accessed: 15.11.2021).
high school students on the need to preserve the sea depths using data obtained in the course of joint research through RAMOGE. 13 A number of important regional agreements have been signed in collaboration with the United Nations Environment Program (UNEP) since 1975, when 16 Mediterranean countries and the European Community approved the Mediterranean Action Plan (MAP-1) as a multilateral environmental agreement, updated in 1995 (MAP-2). Under the joint auspices of UNEP/MAP, a framework convention to protect the Mediterranean Sea from pollution was adopted in Barcelona in 1976. 14 After the Earth Summit in Rio de Janeiro in 1992, it became necessary to revise some provisions of the convention. In 1995, an updated version of the Convention for the Protection of the Marine Environment and the Coastal Region of the Mediterranean Sea (Barcelona Convention) was adopted and signed by 21 Mediterranean countries 15 and the European Community.
The convention implies joint actions to assess and control pollution of coastal resources, to eliminate such pollution and to protect natural and cultural heritage. To specify the provisions of the convention, seven additional protocols have been developed and adopted, including the Discharge Protocol (from ships and aircraft), the Prevention and Emergency Protocol (pollution from ships and emergencies), the Protocol on Land-based Sources and Activities, the Protocol on Specially Protected Areas and Biological Diversity, the Marine Protocol (pollution from exploration and exploitation), the Protocol on Hazardous Waste and the Protocol on Integrated Coastal Zone Management (ICZM). Ministerial conferences on the implementation of the main provisions of the MAP are held once every two years; the permanent secretariat is located in Athens (Greece). The Mediterranean Trust Fund was formed, with the main funding for the implementation of the MAP activities coming from the EU (including the EU's 8th Framework Program for the development of research and technology Horizon 2020 (2014-2020), as well as European Territorial Cooperation Programs), 16 UN agencies and the Global Environment Facility (GEF). 17 One of the successful collaborative projects under the ICZM Protocol was the People for Ecosystem-Based Governance in Assessing Sustainable Ocean and Coastal (PEGASO) project. 18  In the Black Sea basin, the initiative "Black Sea Transboundary Cooperation" (headquartered in Romania) was implemented within the framework of the European Neighborhood policy. A number of projects were financed in two stages (2007)(2008)(2009)(2010)(2011)(2012)(2013)(2014)(2015)(2016)(2017)(2018)(2019)(2020) in all countries of the 16 European Territorial Cooperation // European Parliament. URL: https://www.europarl.europa.eu/factsheets/ en/sheet/98/european-territorial-cooperation (accessed: 15.11.2021). 17 The Barcelona Convention // European Commission. URL: https://ec.europa.eu/environment/marine/internationalcooperation/regional-sea-conventions/barcelona-convention/ index_en.htm (accessed: 15.11.2021). 18 PEGASO Project // Vlaams Institut Voor De Zee. URL: http://www.vliz.be/projects/pegaso/index.html (accessed: 15.11.2021).
Black Sea basin, except Russia and Abkhazia. 19 For example, in 2013-2016 the project "Innovations in Sustainable Management and Protection of Natural Areas" (4GreenInn) was implemented, within the framework of which the "Black Sea Ecopedia" was compiled. One of the project participants was the Fond "Sevastopol", which also connected the Marine Hydrophysical Institute (Sevastopol) and A.O. Kovalevsky Institute of Biology of the Southern Seas. The main operator of the project was the Municipality of Bourgas; among the participants was also the Regional Development Agency of the Southeastern Development Region of Romania (SERDA). 20 After 2014, the participation of the Crimean organizations in the project was suspended. At the sixth meeting of the joint program committee of the initiative in September, 2021 with participation of 9 countries (Armenia, Bulgaria, Georgia, Greece, Moldova, Romania, Russia, Turkey and Ukraine) the main parameters of the cooperation program for 2021-2027 were discussed. 21 Transboundary environmental projects are also being implemented by the Organization of the Black Sea Economic Cooperation (BSEC), whose members are both Black Sea and Mediterranean countries. Five environmental projects have been financed at the expense of the BSEC Project Development Fund. The BSEC Working Group on Environmental Protection developed the BSEC Climate Change Adaptation Strategy for the Black Sea, which was adopted by the Council of Ministers of Foreign Affairs of the organization on December 15, 2017. 22

Prospective Areas of Cooperation
In connection with the observed and projected changes in the climate and environmental conditions, a number of promising areas of cooperation between Russia and the Mediterranean countries can be emphasized. One of them is to study the experience of cultivation of local crops in different countries of the region. Thus, back in 1926Thus, back in -1927I. Vavilov organized a large expedition to the Mediterranean countries to collect samples of plants cultivated there. One of the goals was the subsequent use of collected samples for their cultivation in the south of Russia and the selection of new zoned varieties. Obviously, now the exchange of experience in growing various agricultural crops in the zones of extreme agriculture (in Russia, these include Krasnodar and Stavropol Territories, Crimea) is no less relevant. In recent years there has also been a noticeable increase in the export of crop products from Russia. The fact is that for Russia, the current climate change is generally favorable for the volume of agricultural production, while the drought in the Mediterranean countries has a greater impact on the cultivation of a number of crops.
Since the time of N.I. Vavilov's expedition, the importance of building a collection of the region's flora and fauna has not diminished either. But now we are already talking about the preservation of species diversity. Global drought is considered as one of the reasons for the possible extinction of a number of plant and animal species in nature. In this regard, projects like a lunar ark are already being developed to complement the existing plant seed vaults in Russia, Norway, and other countries.
Cooperation in extinguishing forest fires is no less urgent. Russia has extensive experience in assisting a number of Mediterranean countries with firefighting aviation. For example, in the summer of 2021, such assistance was provided to Greece and Turkey with the use of Russian aircrafts and helicopters on lease. 23 23 Turkey Wildfires: Satellite Images Show Devastation Caused by Deadly Fires, as 'Sabotage' Can't Be Ruled out // Sky News. July 31, 2021. URL: https://news.sky.com/ There are great prospects for international scientific cooperation in the joint creation of specialized databases. In particular, in 2020, Russian climatologists, together with their foreign colleagues created a database on tornadoes in Russia and 14 neighboring countries, which cover the period from the 10th century to 2018. 24 The exchange of knowledge and practical information (knowledge sharing) will make it possible to move on to the formation of joint mechanisms of early prevention of ecological risks. The agenda also includes environmental regulations for biodiversity conservation, regulations for the extraction of organic resources, preservation of spawning grounds and safe migration conditions for marine organisms, as well as development of environmental impact assessments for offshore hydrocarbon field development technologies.
It is important to understand that environmental issues have no borders and are not subject to sanctions. The high risks of exploiting fragile ecosystems, which include the Mediterranean and Black Sea basins, create an urgent need for transboundary cooperation on environmental protection.
In this context, the example of the antisanctions policy of Great Britain, which after leaving the EU, since January 2021 allows its companies to pay for pilotage services for the passage through the Kerch Strait and for the use of Crimean ports through the Crimean Seaports State Unitary Enterprise of the Republic of Crimea, is quite indicative. 25 Life and safety of story/turkey-wildfires-satellite-images-show-devastationcaused-by-deadly-fires-12368521 (accessed: 15.11.2021).
24 "The future of meteorology is in clear forecasts" // Russian Academy of Sciences [«Будущее метеорологии за четкими прогнозами» // РАН]. 21.07.2021. (In Russian). URL: http://www.ras.ru/news/shownews.aspx?id=fdd08ef 4-f008-40e9-9cfb-62ba3e3b7c69 (accessed: 15.11.2021 navigation make foreign authorities forget about the sanctions, even if only on a point-by-point basis. On the agenda is the resumption of transboundary cooperation between the Russian Federation and researchers from other Black Sea and Mediterranean countries on environmental issues in a depoliticized format. An important role in this regard could be played by cooperation within the BSEC, as well as through the Black Sea Trade and Development Bank (BSTDB). In this regard, the Russian Foreign Ministry stresses that "Russia's interest in the BSTDB is explained by the Bank's ability to play a useful role in restoring Russia's cooperation with the CIS and Eastern European countries, as well as in ensuring economic cooperation with Turkey and Greece." 26

Conclusion
The study of the ecological state of the marine environment of the Mediterranean basin as a single ecosystem as a whole has determined the need to consolidate research in the development of the legal and environmental framework for transboundary solutions to the environmental problems of the region. The interdisciplinary synthesis presented in the study has shown that it is promising to unite specialists from specialized scientific institutions and political departments for these purposes. The most successful examples of such cooperation were analyzed, as well as the main international political problems standing in the way of successful transboundary cooperation on environmental protection in the Mediterranean basin with the participation of all stakeholders were identified.