The COCAS project aims to fill a major void in the global system for observing and studying Climate Change and its Impacts (CC&I) on the world's coasts, and thus meeting the expectations of the Green Pact of Europe in terms of infrastructure for advanced observation and monitoring of the climate / environment (Green Deal, Topic 9.1). It brings together scientists from Europe and so-called “Southern” Atlantic and Mediterranean countries, around the most complete and modern platforms currently existing for long-term and high-precision measurements of key physics parameters. , biogeochemistry and marine biology of coastal areas. These measures are not shared internationally, which delays progress on CC&I measurement and forecasting. The COCAS group will dedicate itself to making its data easily accessible internally and externally, to homogenize the sensors and modernize them, to reinforce internal cohesion and share expertise within the network and with the community and public and private end users . Anchored air-sea buoys, CC&I sentinels in coastal marine regions. Compared to the global ocean, the coastal marine space is more productive, responds more intensely to disturbances, and is in direct contact with human populations. This makes it an essential source of resources and services, changes in which under the effect of CC&I are essential to monitor by key quantity measurements, at the air-sea interface and below the surface. The ANR COCAS network will offer Europe leadership on a new infrastructure, made up of Coastal Anchored Buoys (BACs), existing beyond its borders in the coastal areas of less developed countries neighboring Europe. This will complement the transnational networks of LACs from developed, European (ERI JERICO3) and international deep-sea countries in the Atlantic-Pacific tropics (PIRATA and TAO programs). A European infrastructure to monitor the evolution and impacts of climate change in the southern coastal marine environment in the decades to come. In the southern coastal regions, the lack of reliable data requires a multidisciplinary international mobilization, to describe a “zero” state using reference points, dedicated to oceanic and atmospheric parameters, whose knowledge is key to validate forecasts. local and global climatic conditions and assess the impacts. Nineteen BACs have been deployed “to the South”, by the members of the project (Atlantic, Mediterranean and East Pacific basins). The members of the group have started to work together since the beginning of 2017 and the collective has strong technical and basic and applied research. This is the case not only in environmental sciences and human and social sciences. but also in particular for partnerships with local and international companies, the use of substantial financial and human resources, and the development of links with the local industrial and institutional fabric, allowing the dissemination of information to governments and the public about Coastal CC&I. Three structuring objectives. The members of the 16 countries (4 European, 11 in the South and the USA) of the project are committed to working on the three pillars of an EU Infrastructure network: coordination and sharing of expertise internally as well as with the rest of the community, standardization and innovations for quality platforms and data, and easy access for internal and external users. Partnerships are established (see scientific committee) for the integration into the landscape of existing ERIs. To achieve this, the work will consist of animations such as webinars, annual meetings, and bi-monthly videoconferences aimed at creating a common database and coordinating the drafting of the EU Infrastructure project.