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Germany, Recycling, Water
Closing the water cycle
Closing the water cycle Clean freshwater faces various threats such as increasing demand by population growth, pollution and changes in the hydrological cycle due to climate change.
Ralf Otterpohl: a second life for unsuspected nutrient-rich waste
Ralf Otterpohl: a second life for unsuspected nutrient-rich waste Every day cities in Europe discard a useful nutrient-rich resource that could be used to grow crops. Ironically, we treat and process human wastes while we mine non-renewable phosphate and potassium and we consume fossil fuel to make nitrogen fertiliser.