The origin of cities can be traced back to the river valley civilizations of Mesopotamia, Egypt, Indus Valley and China. Initially these settlements were largely dependent upon agriculture; however, with the growth in population the city size increased and economic activity transformed to trading . The process of urbanization gained impetus with the Industrial Revolution 200 years ago and accelerated in the 1990s with globalization and consequent relaxation in market economy. (Guest Editorial)
Original Source [2]
Links:
[1] http://admin.indiaenvironmentportal.org.in/feature-article/bengaluru%E2%80%99s-reality-towards-unlivable-status-unplanned-urban-trajectory
[2] http://www.currentscience.ac.in/Volumes/110/12/2207.pdf
[3] http://admin.indiaenvironmentportal.org.in/category/author/t-v-ramachandra
[4] http://admin.indiaenvironmentportal.org.in/category/author/bharath-h-aithal-0
[5] http://admin.indiaenvironmentportal.org.in/category/journal/current-science
[6] http://admin.indiaenvironmentportal.org.in/category/thesaurus/bangalore-t
[7] http://admin.indiaenvironmentportal.org.in/category/thesaurus/urban-planning
[8] http://admin.indiaenvironmentportal.org.in/category/thesaurus/urbanisation
[9] http://admin.indiaenvironmentportal.org.in/category/thesaurus/air-pollution
[10] http://admin.indiaenvironmentportal.org.in/category/thesaurus/water-pollution
[11] http://admin.indiaenvironmentportal.org.in/category/thesaurus/floods
[12] http://admin.indiaenvironmentportal.org.in/category/thesaurus/groundwater
[13] http://admin.indiaenvironmentportal.org.in/category/thesaurus/vehicular-pollution
[14] http://admin.indiaenvironmentportal.org.in/category/thesaurus/urban-environment
[15] http://admin.indiaenvironmentportal.org.in/category/thesaurus/green-house-gases
[16] http://admin.indiaenvironmentportal.org.in/category/thesaurus/urban-sprawl