It was a scorching hot April afternoon in Keur Moussa, a small farming community about 60 kilometers outside Dakar, Senegal. The landscape was mostly barren and very dry, and a fine red dust settled into our clothes as we walked with community leaders to learn about their efforts to cope with a changing environment. In this part of the world, adapting to climate change is figuring out how to manage water: how to survive for long periods without it, and what to do when too much comes at unexpected times.

When Super Typhoon Haiyan ripped through the Philippines last month, the incredible damage visited on the people, infrastructure, and land was shaped by trends that have been in motion for decades. The country’s population has been growing rapidly, with high concentrations of people living in cities and along the coast; economic growth had been steady, but weak governance and corruption may have exacerbated vulnerability; and the gradual loss of coastal forests and mangroves left many communities exposed to the full brunt of the typhoon’s storm surge. On a positive note, wireless technology and crowd-sourced data helped in disaster response.

In 2009, economist Jeffrey Sachs, alongside more than 20 eminent scholars from different fields, highlighted the importance of biodiversity for human well-being in a policy commentary published in Science. They noted the Millennium Development Goals (MDGs) included a target to achieve, by 2010, a significant reduction in the rate of species loss, and they also noted that it was one of the MDG targets that was most off-track. “Our lack of progress toward the 2010 target,” they said, “could undermine achievement of the MDGs and poverty reduction in the long term.” The 2010 target was missed, and today species are moving toward extinction at an ever faster pace. Last week’s announcement confirming the extinction of Africa’s western black rhino is the latest sad example of this trend.

Cambodia to grow by nearly one-third by 2050; Kenya to more than double; Mali to swell to three times its current size. These were the population projections available when Feed the Future, President Obama’s global hunger and food security initiative, was beginning implementation in 19 focus countries around the globe in 2010.

A woman sat crouched on the side of a busy road in Dakar, a baby in a sling on her back and a basket of peanuts in front. I know only a little French, and no Wolof, but I decided to try anyway. “Bonsoir,” I said, and smiled at the toddler beside her. “Combien?” I asked, pointing at the peanuts.

She smiled back at me, we negotiated a sale, and in exchange for the coins in my pocket I walked away with a few bags of the small, tasty nuts that are grown throughout the “peanut basin” of central Senegal.

1.8 million food producers using improved technologies or management practices. Nearly 9 million children reached through nutrition programs. 2.4 million hectares under improved technologies or management practices. New mechanisms for donor coordination. A forward-looking agricultural research agenda. Innovative private-sector partnerships to support smallholder farmers. These are among the successes reported for the first three years of Feed the Future, the U.S. government’s new global hunger and food security initiative.

The size, composition, and spatial distribution of human populations are constantly changing, and in some areas of the world, they’re changing very rapidly. Related trends in fertility and reproductive health are also in flux. These changes will affect how people experience climate change, both individually and societally.

Over the past several years, community-based adaptation has emerged alongside national and regional climate change initiatives as a strategic, localized approach to building resilience and adaptive capacity in areas vulnerable to climate change.