FILE - In this Jan. 28, 2019 file photo, United Nations Development Program Administrator, Achim Steiner, speaks during the inauguration ceremony of the Africa Center for Climate and Sustainable Development, in Rome. Steiner spoke to The Associated Press on Monday, July 29, 2019, and said the devastating five-year civil war in Yemen has knocked the country back 20 years in terms of development and access to education. Yemen was already the Arab world's poorest nation before the war, which has killed tens of thousands of people. (Maurizio Brambatti/ANSA Via AP, File)
The United Nations Development Program Administrator, Achim Steiner, speaks during the inauguration ceremony of the Africa Center for Climate and Sustainable Development, in Rome on January 28, 2019. Show more

Yemen economy set back by 20 years due to war, UN says