Adaptation to climate change has become a central focus for researchers across various fields, including climate science, environmental science, urban planning, information science and social science, to support policymakers in making informed decisions to build a climate-prepared and resilient society. The major challenges in achieving this goal are (i) lack of seamless interaction between platforms, data spaces, and users, (ii) poor data interoperability as well as service interoperability, (iii) lack of infrastructural support for generating FAIR data, and (iv) legal barriers hindering access to data. CLIMATE-ADAPT4EOSC aims to overcome these challenges by providing an EOSC-centred collaborative research environment equipped with existing EOSC data and services and extended with new data and services, such as Interoperability, FAIRification, Research Results Publishing as Open Data, Data Adaptation, Data Format Compliancy, Mapping and Entity Matching, enabling interoperability and seamless interaction of data that allow the creation of extended services, e.g., Big Data Analytics for climate risk assessments. The project develops a climate change adaption ontology and an EOSC Climate-Adapt Knowledge Graph based on the ontology, supporting findability, accessibility, tracking and life cycle management of research outputs of various kinds, including data, scientific papers, methods, code, software packages and tools. CLIMATE-ADAPT4EOSC also develops three innovative services that provides support to EU Mission climate change adaptation and the European Green Deal. These services have been planned to be demonstrated in Five EU countries.