NEW DELHI – Humanity currently faces multiple, interlinked existential crises. The catastrophic consequences of climate change, ecological degradation, and biodiversity loss have cascading knock-on effects on human health and well-being. As the COVID-19 pandemic illustrates, ecosystem damage can contribute significantly to a global public-health emergency. But scientists are also increasingly finding that ecological restoration, by reversing the threats to soil, biodiversity, water, and other ecosystem services, can deliver major health benefits.