. >> where do you head to o find spiritituality? check out our facebook page and let us know. this week, it's all about the meaning of life on "dw global society." without water, there's no life -- it's our most important resource. anand it's the topic of f this week's "global ideas," our series focusing on p people ad projects involved in climate protection. 80% of the worldld sewage is dumped unprocessedn n the environment. our reporter joaim egger travelled to peru. every year, millions of tourists visit cusco, latin america's oldest settlement, before making a pilgrimage to the world-famous inca site of machu picchu. and that's a huge challenge for cusco's water utility -- even though it has a tradition spanning centuries. from the source, the water flflows through h channels intoe terraced gardedens of tipo buil600 0 yearago, i it'an idyllic placace. 300 people once lived here, explains a hydraulic engineer who's worked here for decades. the ruin is situated 3,500 meters above sea level and is considered a masterpiece of water management. >> tipon was a huge ecological ex