The document discusses biodiversity, ecosystem services, social sustainability, and tipping points in African drylands. It aims to develop a conceptual framework linking policy, land use, and livelihoods through pastoralist decision-making. The objectives are to construct and validate models of pastoralist decision-making, evaluate policy scenarios, and disseminate findings to policymakers and communities. The methods include statistical analysis, modeling household decisions, experiments, and agent-based simulations to explore scenarios around payments for ecosystem services and climate change.