水不足
Water scarcity in Yemen (see: Water supply and sanitation in Yemen) is a growing problem that has resulted from population growth, poor water management, climate change, shifts in rainfall, water infrastructure deterioration, poor governance, and other anthropogenic effects. As of 2011, it has been estimated that Yemen is experiencing water scarcity to a degree that affects its political, economic and social dimensions. As of 2015, Yemen is among the most water scarce countries in the world. The majority of Yemen's population experiences water scarcity for at least one month during the year. In Nigeria, some reports have suggested that increase in extreme heat, drought and the shrinking of Lake Chad is causing water shortage and environmental migration that is forcing thousands to migrate to neighbouring Chad and towns.