Desert locusts are seen on the ground in Sanaa, Yemen, July 12, 2020. The United Nations Food and Agriculture Organization (FAO) has said that the desert locust threat in Africa is one of the biggest challenges facing the world's food systems, already creating devastating impacts in East Africa and Yemen. According to FAO, a small swarm of the pests can in one day eat crops that could have otherwise fed 35,000 people. (Photo by Mohammed Mohammed/Xinhua)

A swarm of desert locusts fly in the air in Sanaa, Yemen, July 12, 2020. The United Nations Food and Agriculture Organization (FAO) has said that the desert locust threat in Africa is one of the biggest challenges facing the world's food systems, already creating devastating impacts in East Africa and Yemen. According to FAO, a small swarm of the pests can in one day eat crops that could have otherwise fed 35,000 people. (Photo by Mohammed Mohammed/Xinhua)

Desert locusts stay on a plant in Sanaa, Yemen, July 12, 2020. The United Nations Food and Agriculture Organization (FAO) has said that the desert locust threat in Africa is one of the biggest challenges facing the world's food systems, already creating devastating impacts in East Africa and Yemen. According to FAO, a small swarm of the pests can in one day eat crops that could have otherwise fed 35,000 people. (Photo by Mohammed Mohammed/Xinhua)

A swarm of desert locusts fly toward the ground in Sanaa, Yemen, July 12, 2020. The United Nations Food and Agriculture Organization (FAO) has said that the desert locust threat in Africa is one of the biggest challenges facing the world's food systems, already creating devastating impacts in East Africa and Yemen. According to FAO, a small swarm of the pests can in one day eat crops that could have otherwise fed 35,000 people. (Photo by Mohammed Mohammed/Xinhua)

A boy walks through a swarm of desert locusts in Sanaa, Yemen, July 12, 2020. The United Nations Food and Agriculture Organization (FAO) has said that the desert locust threat in Africa is one of the biggest challenges facing the world's food systems, already creating devastating impacts in East Africa and Yemen. According to FAO, a small swarm of the pests can in one day eat crops that could have otherwise fed 35,000 people. (Photo by Mohammed Mohammed/Xinhua)