Perspectives are different frameworks from which to explore the knowledge around sustainable sanitation and water management. Perspectives are like filters: they compile and structure the information that relate to a given focus theme, region or context. This allows you to quickly navigate to the content of your particular interest while promoting the holistic understanding of sustainable sanitation and water management.
A paper about how and why fertilisers are used. This includes also the energy lifecycle of fertilisers and, today even more important, measures which can improve the energy efficiency of fertiliser production and use.
GELLINGS, C.W. ; PARMENTER, K.E. (2004): Energy efficiency in fertiliser production and use. In: Efficient Use and Conservation of Energy, Chapter 3 and Fig.1. Encyclopaedia of Life Support Systems: URL [Accessed: 07.09.2010]