AlgaSeat is a modular public seating system that integrates sustainability with functionality. It collects rainwater to cultivate microalgae, reducing carbon dioxide and releasing oxygen through photosynthesis to enhance urban air quality. The microalgae fertilize surrounding vegetation, promoting urban greenery and ecological balance, providing citizens with a greener outdoor experience. Features 1.Microalgae Cultivation: Reduces carbon dioxide and releases oxygen through photosynthesis, improving urban air quality. 2.Adaptable Installation: Easily fits various seat shapes and sizes with a simple assembly process, allowing seamless integration into existing structures. 3.Natural Fertilization: Nutrient-rich microalgae serve as fertilizers for surrounding plants, promoting urban greening and ecological circulation.