Peace parks remain at the top for two months in a row, but the rest of April’s faves includes new posts on population and climate change.

1. Guest Contributor Todd Walters, International Peace Park Expeditions: Imagine There’s No Countries: Conservation Beyond Borders in the Balkans

2. Climate Change and Energy in Defense Doctrine: The QDR and UK Defence Green Paper

3. Book Review: Global Warring: How Environmental, Economic, and Political Crises Will Redraw the World Map by Cleo Paskal

4. Guest Contributor Rear Admiral Morisetti: Climate Change: A Threat to Global Security

5. Copper in Afghanistan: Chinese Investment in Aynak

6. VIDEO: Peter Gleick on Peak Water

7. Megatrends: Embracing Complexity in Today’s Population and Migration Challenges

8. VIDEO: Joshua Busby on Climate Change and African Political Stability

9. The Beat on the Ground: Ethiopia’s Bale Mountains — Cassie Gardener Reports on Integrating Population, Health, and Environment

10. Canada Flip-Flops on Family Planning; Will the G-8 Follow?