Purpose is to place monetary value on services — absorption of carbon dioxide, cleansing oxygen and supplying water
Links:
[1] http://admin.indiaenvironmentportal.org.in/news/study-iit-bombay-ngo-sanjay-gandhi-park-gauge-its-contribution-mumbai%E2%80%99s-ecosystem
[2] http://admin.indiaenvironmentportal.org.in/category/newspaper/indian-express-mumbai
[3] http://admin.indiaenvironmentportal.org.in/category/thesaurus/maharashtra
[4] http://admin.indiaenvironmentportal.org.in/category/thesaurus/sanjay-ganghi-np
[5] http://admin.indiaenvironmentportal.org.in/category/thesaurus/ecosystems
[6] http://admin.indiaenvironmentportal.org.in/category/thesaurus/mumbai
[7] http://admin.indiaenvironmentportal.org.in/category/thesaurus/carbon-dioxide
[8] http://admin.indiaenvironmentportal.org.in/category/thesaurus/drinking-water
[9] http://admin.indiaenvironmentportal.org.in/category/thesaurus/indian-institute-technology-iit
[10] http://admin.indiaenvironmentportal.org.in/category/thesaurus/wildlife
[11] http://admin.indiaenvironmentportal.org.in/category/thesaurus/ecology
[12] http://admin.indiaenvironmentportal.org.in/category/thesaurus/environment