Frictions between the United States and China are intensifying, yet even past geopolitical rivals found ways to collaborate on shared challenges where it squarely served national interests. In November 2022, the CSIS Freeman Chair in China Studies and the Brookings John L. Thornton China Center launched a project to explore safe and effective methods for collaboration among nonstate actors on key challenges facing both nations. The following brief distills takeaways from this work, which included historical case studies of collaboration during the Cold War, workshops with U.S. and PRC experts, and a track 2 dialogue on climate-smart agriculture designed to probe emerging findings.