Two girls return home after filling tanks with clean water at al-Ajlub district, 180 km south of Yemen's capital of Sanaa on March 9, 2014. Villagers in al-Ajlub district have to go dozens of kilometers to fetch clean water eveyday. Yemen is one of the most arid countries in the world. (Xinhua/Mohammed Mohammed)

A girl waits for filling tanks with clean water at al-Ajlub district, 180 km south of Yemen's capital of Sanaa on March 9, 2014. Villagers in al-Ajlub district have to go dozens of kilometers to fetch clean water eveyday. Yemen is one of the most arid countries in the world. (Xinhua/Mohammed Mohammed)

People fill tanks with clean water at al-Ajlub district, 180 km south of Yemen's capital of Sanaa on March 9, 2014. Villagers in al-Ajlub district have to go dozens of kilometers to fetch clean water eveyday. Yemen is one of the most arid countries in the world. (Xinhua/Mohammed Mohammed)

Two girls wait for filling tanks with clean water at al-Ajlub district, 180 km south of Yemen's capital of Sanaa on March 9, 2014. Villagers in al-Ajlub district have to go dozens of kilometers to fetch clean water eveyday. Yemen is one of the most arid countries in the world. (Xinhua/Mohammed Mohammed)

A girl waits for filling tanks with clean water at al-Ajlub district, 180 km south of Yemen's capital of Sanaa on March 9, 2014. Villagers in al-Ajlub district have to go dozens of kilometers to fetch clean water eveyday. Yemen is one of the most arid countries in the world. (Xinhua/Mohammed Mohammed)

A donkey is seen nearby while people fill tanks with clean water at al-Ajlub district, 180 km south of Yemen's capital of Sanaa on March 9, 2014. Villagers in al-Ajlub district have to go dozens of kilometers to fetch clean water eveyday. Yemen is one of the most arid countries in the world. (Xinhua/Mohammed Mohammed)

A boy waits for filling tanks with clean water at al-Ajlub district, 180 km south of Yemen's capital of Sanaa on March 9, 2014. Villagers in al-Ajlub district have to go dozens of kilometers to fetch clean water eveyday. Yemen is one of the most arid countries in the world. (Xinhua/Mohammed Mohammed)

People fill tanks with clean water at al-Ajlub district, 180 km south of Yemen's capital of Sanaa on March 9, 2014. Villagers in al-Ajlub district have to go dozens of kilometers to fetch clean water eveyday. Yemen is one of the most arid countries in the world. (Xinhua/Mohammed Mohammed)