Earth summit 6 C (Computer program language) 3 Data structures (Computer science) 3 Education 3 Sustainable development 3 Developing countries 2 Earth 2 Environment 2 Environmental Protection 2 Ganga action plan 2 History 2 India 2 Radio activity and pollution 2 Rio Declaration 2 SAARC 2 Social Sciences 2 South Asia 2 Soviet Union 2 AIDS (Disease) -- Prevention -- Congresses-- Acquired Immunodeficiency Syndrome -- prevention & control-- AIDS (Disease) -- Prevention 1 Academic libraries 1 Acid Rain 1 Air pollution 1 Airplanes-piloting 1 Analysis of soil 1 Analysis of water pollutants 1 Asia-Pacific Water summit 1 BRICS COUNTRIES 1 Bleeding forests 1 C 1 C PROGRAMMING LANGUAGE 1