Today’s greatest sustainable development challenges can only be solved if we work together more effectively across the global development, health, and environmental communities. This report, co-authored by the Bridge Collaborative and UNDP, highlights three global challenges that require cross-sector solutions, and actions that can be taken now to drive bigger change faster for people and the world we share. A workbook drawn from this report, Delivering Bigger Change Faster: A Workbook on Strengthening Proposals for Projects With Cross-sector Impacts, Version 2.0 was published in June 2021.