The world’s dire ecological situation and the challenges faced by present and future generations are increasingly clear. A shared consciousness of our global interdependence must give rise to a new common logic, to define and recognize the global commons that supports life on Earth — the planetary system that connects us all and on which we all depend. This is a foundational step toward the establishment of a governance system to effectively manage human interactions with the Earth System. Fifty years after the 1972 Stockholm Conference on the Human Environment, the signatories of this civil society Declaration call upon the United Nations, its agencies, and all Member States to act upon a pathway towards the critical paradigm shift we need. Thus, we urge you to support this effort by signing the Declaration for Stockholm+50, setting forth a four-step pathway towards the critical paradigm shift we need to ensure effective planetary governance.