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Resources can be classified as renewable and non-renewable. Renewable resources are those resources that will get renewed and replenished through physical, chemical and mechanical processes. Even though water is a renewable resource and can be replenished able, nearly 60% of all the fresh water sources are under threat by pollution. Nearly 95% of the sewage is let into rivers in developing countries from the discharge from factories and other chemical pollutants. All the river systems in the developing countries are under the threat of pollution from sewer waste. India is the second largest populous country. But the freshwater resources available is only 4%.