On 31 October 2003 Esther Murenghi pours the water she have just collected from a pit and that she will use to water her field, on the shores of Lake Naivasha, some 100km north of Nairobi, Kenya. The cabbage field she grows is also irrigated thanks to an engine pump that distributes water from the nearby lake: Lake Naivasha, the only freshwater lake in the Rift Valley, is a fragile eco-system endangered by the over exploitation of its alkaline free water used to feed the many flower plantations that have mushroomed around its shores.