Against the stunning backdrop of Marojejy National Park, I recently crossed paths with a conservationist from a very different background, working on the opposite side of Madagascar. But, it turns out, the communities we work with face many of the same challenges, and our meeting spawned a new population, health, and environment (PHE) program.

As policymakers respond to the threat of climate and environmental change, the concept of resilience has found itself at the center of discussion. Few scientists and policymakers, however, can come to a consensus on how to define, evaluate, and build resilience.

This past December, Bangladesh turned 42, bringing the country Henry Kissinger once predicted would become a “basket case” into comfortable middle age (though perhaps this analogy breaks down for countries like Switzerland, age 722).

What do melting Himalayan glaciers have to do with food security in Cambodia? Not much, thought an aid practitioner trying to boost food security along the lower reaches of the Mekong River – until she heard a colleague working on the Tibetan Plateau describe the downstream implications of climate change in the Himalayas. Everything she was working on, she suddenly realized, could be literally washed away.

“What’s become clear to me on population is that it’s really a local issue,” said Andrew Revkin in an interview at the Wilson Center. “You get the impression, ‘Oh didn’t we solve that problem?’” And to some extent, demographic shifts around the world are largely heading in the direction people anticipated, with a leveling off mid-century. But “no one really knows what happens then,” he said. “All it takes is a tiny diversion of fertility rates and things could really grow or shrink.”

Family planning, which saw a relative decline in financial support from the international development community over the last two decades, is now back in vogue, thanks in large part to the Bill and Melinda Gates Foundation. After spearheading the London Summit on Family Planning in 2012 alongside many governments, the foundation’s recently released 2014 Annual Letter sets out to dispel three “myths” about development, one of which is “saving lives leads to overpopulation.”

The original version of this article, by A. Tianna Scozzaro, appeared on Population Action International’s All Access blog.

For the past 11 months, a group of United Nations member states has been holding meetings seeking input on future goals for sustainable development once the Millennium Development Goals (MDGs) expire in 2015. Led by co-chair ambassadors from Hungary and Kenya, this Open Working Group of 69 countries has delved into topics ranging from governance to health and everything in between.

In 2008 and 2010, the price of many basic food stuffs soared, sparking a series of riots and food crises around the world. People in the poorest countries – those living with the smallest margins – were most affected, while the economies of developed nations were able to absorb the price changes. According to Notre Dame’s Global Adaptation Index, how climate change will impact different countries depends not only on their vulnerability to physical changes, but also their ability to absorb these impacts. [Video Below]