Sierra Leone contact tracers seek to track down anyone who may have been exposed to the deadly disease.
Kiribati President Anote Tong leads a Pacific island nation that’s facing a likely exodus due to rising sea levels. He weighs long-term options: stay and defend or flee to higher ground.
In the midst of Syria's civil war, doctors and a network of young volunteers are venturing into combat zones to vaccinate children against polio.
Courageous bands of volunteers are standing up to ISIS and the Assad regime to vaccinate Syrian children.
Health workers—many of them women—continue to face bullets and bombs as they inoculate children.
Pakistani doctor's role in health campaign sparked local suspicions that efforts to fight polio were part of a Western plot.
Volunteers fighting polio in Pakistan are under attack as a result of a U.S. health program to track an al Qaeda leader.
To stop infected bodies from spreading the disease in Sierra Leone, health officials persuaded local leaders to change how villagers mourned.
How poverty, density, and fragmentation in Sierra Leone's capital city fueled the spread of the deadly Ebola virus.
Photojournalist Allison Shelley documented Haiti for a year after the 2010 quake. She went back this month to check on rebuilding progress.
Stumbling blocks to REDD+ in recent years have been many, with a significant one being reliable technology. That is no longer a problem.
Unilever CEO Paul Polmon is a corporate role model on climate change.