Warfare, severe food shortages and disease are devastating Yemen, already one of the world's poorest countries. The U.N. has called the situation the "largest humanitarian crisis in the world," and U.N. Ambassador Nikki Haley said recently that "no one should ever have to live the way the people of Yemen are living."

Why it matters: The U.N. estimates that more than 22 million Yemenis are in need of humanitarian assistance. The population of Yemen is 27 million.

By the numbers

There are 17.8 million food-insecure people in Yemen, according to the U.N. Office for the Coordination of Humanitarian Affairs (OCHA).

in Yemen, according to the U.N. Office for the Coordination of Humanitarian Affairs (OCHA). Around 7 million people are on the brink of famine.

are on the brink of famine. 13% of total Yemeni casualties are children; There have been more than 8,700 conflict-related deaths and more than 50,000 injuries.

are children; There have been more than 8,700 conflict-related deaths and more than 50,000 injuries. "An average of 65 people have been killed or injured every day since the escalation of the conflict," according to OCHA's Humanitarian Needs Overview (HNO).

have been killed or injured every day since the escalation of the conflict," according to OCHA's Humanitarian Needs Overview (HNO). 16 million Yemenis don't have access to "safe water and sanitation," per the HNO.

don't have access to "safe water and sanitation," per the HNO. There are an estimated 1 million cases of cholera.

cases of cholera. There are 2 million internally displaced people.

How we got here