A sustainability initiative by Greydient Lab exploring how small-scale design interventions can transform everyday waste into community resources while addressing urban environmental challenges. Through "Coffee Ground Zero" we demonstrate that meaningful sustainability solutions emerge from reimagining what cafes already discard daily. Our three-part framework: Advocacy, Activate, and Access, transforms coffee grounds and food waste into composting resources while building long-term capacity for waste reduction practices across Bangkok's urban community. By combining tangible starter kits with digital education, we prove that circular design thinking can create value from disposal problems without requiring massive infrastructure investment.