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This is an audio version of the Wikipedia Article: https://en.wikipedia.org/wiki/Water_p... 00:01:27 1 Overview 00:03:36 2 Specific issues 00:04:26 3 See also Listening is a more natural way of learning, when compared to reading. Written language only began at around 3200 BC, but spoken language has existed long ago. Learning by listening is a great way to: increases imagination and understanding improves your listening skills improves your own spoken accent learn while on the move reduce eye strain Now learn the vast amount of general knowledge available on Wikipedia through audio (audio article). You could even learn subconsciously by playing the audio while you are sleeping! If you are planning to listen a lot, you could try using a bone conduction headphone, or a standard speaker instead of an earphone. Listen on Google Assistant through Extra Audio: https://assistant.google.com/services... Other Wikipedia audio articles at: https://www.youtube.com/results?searc... Upload your own Wikipedia articles through: https://github.com/nodef/wikipedia-tts Speaking Rate: 0.7478684653330439 Voice name: en-US-Wavenet-B "I cannot teach anybody anything, I can only make them think." Socrates SUMMARY ======= Brazil’s major and medium size metropolitan areas face increasing problems of water pollution. Coastal cities such as Rio de Janeiro and Recife suffer effects of upstream residential and industrial sewage contaminating feeder rivers, lakes, and the ocean. In 2000, only 35% of collected wastewater received any treatment.For example, the Tietê River, which runs through the São Paulo metropolitan area (17 million inhabitants), has returned to its 1990 pollution levels. Despite the support from the IDB, the World Bank and Caixa Econômica Federal in a US$400 million cleanup effort, the level of dissolved oxygen has returned to the critical level of 1990 at 9 mg per liter due to increased levels of unregulated sewerage, phosphorus, and ammonia nitrogen discharged into the river. As of 2007, the state water company Sabesp projects that a minimum of R$3 billion (US$1.7bn) would be necessary to clean up the river.