Tunisian villager Ounissa Mazhoud and her cousin Djamila lead a donkey, with two jerry cans tied to it, and cautiously descends a stony hill towards the last local source of water in the remote village of Ouled Omar, 180 kilometres (110 miles) southwest of the capital Tunis. The north African country, in its fourth year of drought, is grappling with its worst water scarcity in years. "Today, due to climate change, almost all springs are dried up and all roads are destroyed," says Ramzi Sebtaoui, a stockbreeder. IMAGES AND SOUNDBITES