The Triple Challenge: synergies, trade-offs and integrated responses for climate, biodiversity, and human wellbeing goals

Humankind faces a Triple Challenge: averting dangerous climate change, reversing biodiversity loss, and supporting the wellbeing of a growing population. Action to address each of these issues is inherently dependent on action to address the others. Local, national, and international policy goals on climate change, biological diversity, and human wellbeing have been set. Current implementation measures are insufficient to meet these goals, but the Triple Challenge can still be met if governments, corporations, and other stakeholders take a holistic perspective on management of land and waters. To inform this effort, we identify a set of priority policy responses drawn from recent international assessments that, whilst not being the only potential solutions, can form the core of such a holistic approach. We do this through an iterative process using three methodological approaches: (i) structured literature review; (ii) deliberative expert analysis; and (iii) wider consultation, before synthesizing into this paper. Context-appropriate implementation of responses will be needed to capitalize on potential policy synergies and to ensure that unavoidable trade-offs between management of land and waters for climate mitigation, biodiversity restoration, and human wellbeing outcomes are made explicit. We also set out four approaches to managing trade-offs that can promote fair and just transitions: (1) social and economic policy pivoting towards 'inclusive wealth'; (2) more integrated policymaking across the three areas; (3) 'Triple Challenge dialogues' among state and non-state actors; and (4) a new research portfolio to underpin (1), (2), and (3).Key policy insights:Multiple recent global assessments provide a strong scientific basis for action on each of the three aspects of the Triple Challenge - climate, biodiversity, and human wellbeing (with a focus on food and nutrition) - but they do not provide an integrated perspective on how to address them simultaneously.Synthesis of these assessments identifies a portfolio of five core policy responses that deliver across the Triple Challenge: (i) rapidly cutting fossil fuel use; (ii) promoting sustainable, healthy diets; (iii) increasing food productivity and cutting food loss and waste; (iv) implementing nature-based solutions at scale; and (v) strengthening governance and management of land and waters.Even with widespread implementation of that portfolio, trade-offs between climate, biodiversity, and wellbeing outcomes might be unavoidable. Policymakers, researchers, and other actors should explicitly identify such trade-offs, and take steps to ensure management priorities are set through equitable dialogue processes informed by integrated research.