1. Black Sea Basin

1.1. The Importance of the Black Sea Basin, Its Geographic and Socioeconomic Characteristics

The Black Sea Basin is a strategic geographical region located between Europe and Asia. Bordered by Türkiye, Bulgaria, Romania, Moldova, Ukraine, Georgia, and the Russian Federation, this basin has a wider sphere of influence encompassing approximately 20 countries. With this feature, it holds an important position both in historical transit routes and in today’s economic and political cooperation.

The basin’s geographical structure, climate diversity, transportation routes, and cultural richness make it of great importance. In particular, the Bosphorus Strait is of vital importance for transit cargo transportation across the Black Sea. This situation demonstrates that the region is a strategic area from both commercial and geopolitical perspectives.

The socio-economic structure of the region is also a quite complex one. While countries such as Türkiye, Russia, and Ukraine have large economies, other countries have developing or transition economies. Therefore, different levels of development, industrialization, and environmental policies are observed in the basin. These differences both enrich and complicate regional cooperation processes.

Industrialization, energy production, and dense urban settlement constitute pressure on natural resources and increase cross border environmental problems. Therefore, the Black Sea Basin is of critical importance for not only from strategic point of view but also in terms of sustainability. An environmental problem in one country could spread out to neighboring countries through wind and waterways thus, causing it to become a regional threat.

Due to these characteristics, the Black Sea Basin is more than just a sea basin; it is a prominently significant economic and environmental complex on a global scale. The lifestyles of the communities living in the region and sectors such as agriculture, fishing, and tourism are directly dependent on natural resources of the basin. Therefore, the sustainable management of the basin is of a vital importance for economic and social stability.

The urbanization rate in the region is increasing each year. In particular, the population of coastal cities is growing rapidly, leading to infrastructure shortages, poor-quality residential heating methods, and traffic congestion. This situation becomes more striking during the winter months due to increased heating fuel consumption of households.

Similar to its economic potential, fragility of the region is also very high. Population growth, industrial pollution, uncontrolled urbanization, and energy production methods are not only creating pressure on natural resources and but also, they increase cross border environmental problems. In this context, the Black Sea Basin has critical importance not only for its strategic value but also for sustainability context.

1.2. The Ecological Importance of the Black Sea Basin

The Black Sea Basin stands out for its unique ecosystem diversity, which is rare in worldwide. The basin is home to a high biological diversity with its marine environment, coastal zones, large forest areas, wetlands, and fertile agricultural lands. Fishing being one of the cornerstones of the regional economy is also, a fragile aquatic ecosystem requiring protection.

The Black Sea is particularly known for the lack of oxygen in its bottom level waters (anoxic structure) and holds the title of being the world’s largest anoxic sea. This unique hydrographic structure makes it extremely vulnerable to environmental threats such as pollution and climate change. This situation highlights that the Black Sea as a region requires in-depth study not only from a biological but also, from a scientific perspective.

The region also stands out for its high level of endemic species. Dense forest cover, river basins, coastal habitats, and internationally significant bird migration routes are natural assets that require serious conservation strategies. However, human caused pressures, such as irregular settlements, industrial activities, and urban waste, threaten these balances. The main problems threatening the ecosystem include coastal area degradation, eutrophication (nutrient accumulation), and the spread of invasive species.

The forests of the basin are of great value due to their contribution to the region’s carbon balance and their role in combating climate change. In particular, the rich vegetation that has developed in the humid coastal zone has made these areas strategic not only from a natural but also from a climatic point of view. However, uncontrolled land use, fire risk, and unplanned urbanization continue to threaten this ecological asset.

Wetlands are also indispensable components of the Black Sea ecosystem. Regions such as the Kızılırmak Delta, Colchis Plains, and Böğürtlen Lake serve as critical ecological stopover points for thousands of migratory birds, providing them with shelter and breeding grounds. The preservation of air and water quality in these habitats is of vital importance not only for the local environment but also for the global survival of species.

Agricultural lands are also a primary source of livelihood for the local population. Abundant rainfall and mild climate conditions provide natural advantages for agricultural production along the Black Sea coast. However, intensive use of fertilizers and pesticides negatively impacts soil and groundwater quality, leading to pollution that extends into marine ecosystems and triggers chain reactions.

Fishing is one of the region’s primary activities, both for food security and economic vitality. Unfortunately, unregulated fishing, marine pollution, and invasive aquatic species pose serious threats for fish populations. In this context, the continuous monitoring of air and water-borne pollutants is not only critical for environmental protection but also for protection of human health.

For all these reasons, the Black Sea Basin should be regarded not only for its geopolitical location or natural resources but also as an ecological heritage that must be protected on a global scale. The sustainability of the region’s natural systems holds vital significance not only for the regional environment but also for the integrity of global biodiversity.

1.3. Black Sea Basin Countries and Common Environmental Challenges

Environmental protection in the Black Sea Basin is a shared responsibility of geographically interconnected countries. To this end, the member countries of the Black Sea Economic Cooperation Organization (BSEC) are not only working together closely, under the BSEC umbrella but also, they cooperate within other regional initiatives. Environmental issues such as air pollution, water pollution, waste management, and loss of biological diversity have a cross-border character.

Therefore, the countries bordering the Black Sea signed the Convention on the Protection of the Black Sea Against Pollution (Bucharest Convention) in 1992, laying down the legal foundation for regional environmental cooperation. The Convention was established to promote joint action and data sharing among the countries in the basin on environmental protection.

In Türkiye, Bulgaria, Romania, Ukraine, Georgia, and other countries, the main pollutants are widespread use of domestic fuel, old industrial facilities, motor vehicle emissions, and thermal power plants. In Black Sea coastal cities, ship emissions and port activities are clearly observed to impair air quality.

Since air pollution in the Black Sea Basin is a cross-border issue, cohesion in data sharing, joint monitoring systems, and the harmonization on environmental policies among countries should be ensured. To this end following actions should be encouraged:

• Establishing joint environmental databases,
• Developing coordinated early warning systems,
• Promoting cross-border environmental projects.

Strengthening cooperation with regional and international organizations such as BSEC, UNDP, and WHO is necessary. Air pollution is an environmental problem that affects everyone regardless of age and health status, but poses greater risks to children, the elderly, and pregnant women. Therefore, raising health awareness in urban and rural areas, improving indoor heating methods, and continuously monitoring air quality are of vital importance.

In conclusion, the following steps should be taken to establish an effective air quality strategy in the Black Sea Basin:

• Establishing joint monitoring networks based on data sharing,
• Accelerating energy transition,
• Conversion of urban transport and domestic fuel systems,
• Preparation of special port emission plans for Black Sea coastal cities.