Conceptual innovations are a central feature of global environmental governance. Confronting degradation and unsustainability, scholars and practitioners turn to new concepts to identify, make sense of, and chart new directions towards meaningful governance solutions. But why do some concepts create lasting changes to governance institutions and governance practices, while others do not? Ideational theories of international relations highlight the importance of normative fit. In this paper we analyze the concept of ecosystem services to show that normative fit is just one dimension of governance fitness, which also includes practical fitness. Ecologists and economists coined the concept of ecosystem services to make biodiversity conservation intelligible to decision-makers versed in economic thinking. It has gained rhetorical traction, but ultimately failed to change how we treat nature because it lacks practical fitness. We interviewed fifty-six individuals working in twelve international organizations that have sought to translate the concept of ecosystem services into practice. Our analysis reveals forces limiting practical fit and constraining institutional uptake at three levels of analysis: structural, organizational, and agent. We present a cautionary tale that pushes scholars to carefully consider practical fit alongside normative fit when suggesting new concepts as organizing frames for how we govern global environmental challenges.

After a decade of negotiation, countries adopted a new, legally binding agreement on climate change. Excitement for a new era in the climate regime is palpable among pundits and policy makers alike. But such enthusiasm largely overlooks that most of the Paris Agreement’s provisions represent continuity with existing climate policy, not a break with the past. This forum argues that the Paris Agreement is a dangerous form of incrementalism in two ways. First, it repackages existing rules that have already proven inadequate to reduce emissions and improve resilience. Second, state and nonstate actors celebrate the Agreement as a solution, conferring legitimacy on its rules; I suggest that, beyond the strong desire to avoid failure, developing countries and nongovernmental organizations accepted the Paris Agreement to secure the participation of the United States and to uphold previous agreements. Given the reification of existing rules, the ratchet-up mechanism and nonstate actors offer the last remaining hopes in global efforts to catalyze climate action on a scale necessary to safeguard the climate.