Worldwide, the natural environment is straining under the weight of a myriad of threats, and time is quickly running out to stem the damage before it becomes irreversible. The urgency of the situation prompted leaders from 64 countries around the world to sign a Pledge for Nature on Sept. 28, committing to work together to put ecosystems—land, ocean, and freshwater—on a path toward sustainability. The group released the pledge ahead of the Sept. 30 United Nations Summit on Biodiversity, which will bring together heads of state and other government representatives under the theme of “Urgent action on biodiversity for sustainable development.”

Can you guess which “advanced” nation hasn’t yet decided if it should sign on to such a radical proposal?