Yemen is projected to be the first Arab country that will use up all of its groundwater, but no-one knows exactly when the water table will dry out or fall beyond a viable level for human use.
In a race to shape public opinion, the government has developed a national mascot to encourage water conservation.
Rowyan is an animated raindrop, a cheery cartoon character with moustache and headdress. His wife, Rowyana, has curling eyelashes. She carries a handbag and wears a veil and full-length black robes.