The Data We Own: A How-To Guide for Environmental Data Sharing is a digital zine designed to help environmental and climate justice organizations navigate the complexities of sharing data responsibly and equitably. Data sharing is a fundamental part of innovation for environmental justice because it enables collaboration, amplifies community voices, and supports evidence-based decision making to address systemic inequities. This guide prompts considerations and conversations around practices like data protection, transparency, and equitable access to ensure justice remains a key piece of environmental efforts.