Under international law, someone who flees their country because of conflict or persecution is a refugee, but someone who flees because of inability to meet their basic household needs is not. In the case of Somalia, it is increasingly difficult to make any meaningful distinction between the two.

“You can’t build a peaceful world on an empty stomach,” Secretary of State John Kerry said yesterday at a high-level working session on resilience and food security, quoting Norman Borlaug, the father of last century’s “Green Revolution.”

As global environmental change accelerates, understanding how population dynamics affect the environment is more important than ever. It seems obvious that human-caused climate change has at least something to do with the quadrupling of world population over the last 100 years.

Migration is an “extreme” form of climate adaptation, but it does pay off for some, write Md. Monirul Islam et al. in a new article in the journal Climatic Change. In a study analyzing two Bangladeshi fishing communities, one long-established, the other the result of migration, the authors examine the effects of climate-induced migration on livelihood vulnerability.

Asia is going through an unprecedented wave of urbanization. Secondary and tertiary cities are seeing the most rapid changes in land-use and ownership, social structures, and values as peri-urban and agricultural land become part of metropolitan cityscapes. All the while, climate change is making many of these fast-growing cities more vulnerable to disasters.

The original version of this article, by Lisa Palmer, appeared on Future Food 2050.

As a boy growing up on the shores of Lake Victoria in Kenya, Harvard international development professor Calestous Juma noticed a thing or two about innovations designed to bring more food into his community. He noticed, for instance, that the fishermen were always tinkering with new ways to trap fish while his father, a carpenter, would build the traps. He also noticed that his grandmother, a peanut grower, and other farmers who grew traditional crops such as sweet potatoes, struggled with ways to increase production beyond simply planting the best quality seeds and tubers.