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Part 1 The problems: water; food; natural disasters; physical communications; physical resources; natural environments; security. Part 2 Getting the information: human perception; radiation and matter - reflection and absorption, thermal emission, artificial radiation; detecting radiation - photographs, electromechanical methods, passive microwave imaging, active microwave or radar imaging; sources of remotely sensed data; displaying information - other kinds of data. Part 3 Interpreting the information: the weather and climate; the sea; the land; natural vegetation; use of the land; beneath the surface. Part 4 Using the information: water resources; food and fibre; physical resources; communications; disasters; environmental change; military uses. Part 5 Operational issues: benefits and costs; training data distribution; future prospects. Appendices: training opportunities; sources of images.