Julian Pettifer is in Peru, where last year he predicted that El Nino would bring disaster. On his return, he discovers that cholera has followed in the wake of serious flooding.
From India, Suntia Thakur profiles Medha Patkur, a woman who has spent 13 years fighting against government plans for a dam on the Narmada river, while Angus Robertson reports from the Alps on why Austrians are hoping water can do for them what oil did for the Texans.
(Water Week concludes with The Money Programme tomorrow at 7.45pm)

Then Evolution Weekend: Natural Selections
Jane Goodall, conservationist, talks about the chimpanzees she has studied for 38 years.
(Stereo)