Evidence suggests that the world has become a more peaceful place since the late 1940s, with a steady decline in inter-state wars. Intra-state conflict also declined through the 1990s but spiked in the mid-2000s. Cyberattacks, increasing militarization and the use of sharp power, the proliferation of terrorist and criminal organizations, and environmental degradation all bring into question our ability to sustain a peaceful world. Green School faculty research global conflict and cooperation by exploring issues related to security, foreign policy, and governance. We examine the role of increased trade and prosperity, democratization, advancing equality, transnational organizations, civil society and domestic political processes in contributing to global peace.