Technology 171 Technology transfer 121 Water-supply 92 Nutrition 82 Appropriate technology 68 Technological innovations 67 Social aspects 62 more ... Nutrition policy 59 Environmental aspects 57 Management 55 Power resources 53 Water resources development 47 Economic aspects 43 Sanitary engineering 38 Technology and state 37 Sanitation 36 Food supply 34 International cooperation 33 Renewable energy sources 33 Sewage disposal 30 Energy policy 28 Congresses 27 Environmental policy 26 Pollution 25 Biotechnology 24 Design and construction 24 Environmental protection 23 Malnutrition 22 Purification 22 Water-supply, Rural 22 less ...