The public trust doctrine holds promise as a tool for combatting international climate inaction. A global public trust in the Earth’s atmosphere may be a feasible avenue for generating international cooperation in this issue. The public trust doctrine is a viable and underutilized mechanism of understanding our collaborative obligations with respect to natural resources. This Article looks to the historical origins and current presentations of public trusts to extract features which indicate its effectiveness and appeal for modern climate change applications. Additionally, it presents two circumstances under which a global public trust in the atmosphere could eventually develop.