With climate adaption and mitigation efforts failing to keep pace with climate-related risks, the need for a global regime on geoengineering will be increasingly pressing, write Elizabeth L. Chalecki and Lisa Ferrari in June’s top post. The norms of just war theory could provide a starting point for developing a code of conduct for geoengineering.

Rebecca Lorenzen covers the challenges faced by communities with erratic water supplies, and Olivia Smith reports on how population dynamics affect community resilience. Mara Tignino and Laura E. Turley ask whether international rivers will follow an emerging trend and gain legal rights to sue for their protection. And rounding out our top five, we examine the hidden dangers of hypertensive disorders in pregnancy.

1. Engineering the Climate—or Deploying Disaster? Applying Just War Theory to Geoengineering by Elizabeth L. Chalecki & Lisa Ferrari

2. Sustainable Water, Resilient Communities: The Challenge of Erratic Water by Rebecca Lorenzen

3. A More Resilient World: The Role of Population and Family Planning in Sustainable Development
 by Olivia Smith

4. Granting Rivers Legal Rights: Is International Law Ready for Rights-Centered Environmental Protection? by Mara Tignino & Laura E. Turley

5. Every 11 Minutes: Hypertensive Disorders in Pregnancy Are Deadly (and Have Long-Term Consequences for Mothers and Children) by Rebecca Lorenzen