Understanding population dynamics and climate change is essential to building resilience across the world's most vulnerable regions, said Roger-Mark De Souza in a recent interview with ClimateWire. Changes in climate are likely to hit hardest in regions with fast growing populations, but their connection goes even deeper. "When you look at changes in the environment and climate change impacts, those who are most vulnerable to those changes are the very young and the very old," De Souza said. Read more from De Souza and other climate and demography experts at ClimateWire (please note this article is behind a paywall). For a version of the article that's free and open to the public, go to Scientific American.