The development of sustainable hydrogels requires a dual focus on renewable feedstocks and energy-efficient fabrication strategies. Here, we present two complementary green approaches that address key challenges in the design and processing of high-performance hydrogels. The first approach is a biomimetic design strategy inspired by the hierarchical architecture of spider silk [1]. Using hyaluronic acid as a renewable polymer backbone and engineering a dynamic cross-linking network, the resulting hydrogels effectively overcome the long-standing trade-off between mechanical strength and self-healing efficiency. Complementing this materials design strategy, the second approach focuses on sustainable hydrogel fabrication through high-performance visible- and sunlight-induced polymerisation[2]. This light-driven process enables rapid hydrogel formation under low-energy conditions, including natural sunlight, and is compatible with 3D and 4D printing technologies. As a result, complex hydrogel architectures and stimuli-responsive structures can be efficiently fabricated using environmentally benign processing routes. Together, these two complementary strategies provide a coherent perspective on how biomimetic network engineering and energy-efficient processing can jointly inform the development of functional and sustainable hydrogels for biomedical and advanced manufacturing applications.