Prof Thomas Crowther is a Welsh ecologist in the Department of Global Ecosystem Ecology at ETH Zurich, where he founded Crowther Lab, an interdisciplinary group of scientists studying global ecosystems and generating knowledge to protect biodiversity and address climate change. He serves as the chair of the UN Decade on Ecosystem Restoration advisory board and chief scientific advisor to the UN’s Trillion Trees Campaign. Crowther is the founder of Restor, a science-based open-data platform that provides ecological insights, transparency and connectivity to conservation and restoration efforts across the globe. Restor was named a finalist for the Royal Foundation’s 2021 Earthshot Prize. Crowther has been named a Young Global Leader by the World Economic Forum and serves on the advisory council of WEF’s Trillion Trees initiative.