Highpopulationdensity, a poor ratio of available water to demand, and regional imbalances in available water supplies are serious challenges for China in managing its usable water supply.
The risk of loss of lives and economic disaster in the southern Mediterranean is high due to strong populationdensity along its coasts: around 150 million people concentrated in 46, 000 kms of coastline, 110 million of them living in cities bordering the sea and some 200 million tourists visiting the area every year.