Reimagining the façade as an active environmental system rather than a passive building skin, this project develops a modular biochar–clay composite panel that integrates carbon storage, passive thermal regulation, and circular construction. By combining locally sourced clay with biochar, the material transforms atmospheric carbon into a long-term architectural resource while reducing embodied emissions. Computationally informed geometry enhances surface performance, and a reversible French cleat assembly system enables rapid installation, maintenance, and disassembly without damaging the panels. Together, material innovation, environmental performance, and design for disassembly redefine the façade as a regenerative architectural component that contributes to climate resilience throughout its lifecycle.