A child stands by bottles as he fills them with water provided by a charity pump in Sanaa, Yemen, on Dec. 11, 2019. According to UNICEF, the water supply and sanitation systems have been severely affected by the conflict in Yemen. (Photo by Mohammed Mohammed/Xinhua)

A child stands by a bottle filled with water provided by a charity pump in Sanaa, Yemen, on Dec. 11, 2019. According to UNICEF, the water supply and sanitation systems have been severely affected by the conflict in Yemen. (Photo by Mohammed Mohammed/Xinhua)

People fill bottles with water from a charity pump in Sanaa, Yemen, on Dec. 11, 2019. According to UNICEF, the water supply and sanitation systems have been severely affected by the conflict in Yemen. (Photo by Mohammed Mohammed/Xinhua)

People get water from a charity pump in Sanaa, Yemen, on Dec. 11, 2019. According to UNICEF, the water supply and sanitation systems have been severely affected by the conflict in Yemen. (Photo by Mohammed Mohammed/Xinhua)

A man fills bottles with water from a charity pump in Sanaa, Yemen, on Dec. 11, 2019. According to UNICEF, the water supply and sanitation systems have been severely affected by the conflict in Yemen. (Photo by Mohammed Mohammed/Xinhua)