Water is an indispensable resource for our daily lives and industrial activities. As a consequence of its widespread utilization, hydrates are also among the most familiar and important classes of materials. Hydrates are involved in a wide range of technologies, including those that contribute to the strength development of concrete and those used as conversion coatings for automotive steel sheets prior to painting. At the same time, hydrates can also be responsible for various technological and environmental challenges. The effective utilization of natural resources is also a key consideration throughout our research and development activities. My research focuses on hydrate-based approaches to addressing pressing global issues related to the environment and natural resources. I choise research themes through which hydrates can directly contribute to sustainable solutions for these societal challenges. In particular, I explore the use of high pressure, which can significantly alter the stability of structurally flexible hydrates, as well as dehydration reactions that enable precise control of water content. By integrating these approaches, I pursue the development of novel CO₂ mineralization pathways. In addition, I investigate methods for imparting functionality to the synthesized materials, including crystal morphology control and the creation of porous structures, thereby promoting their effective utilization in a variety of applications.