MMRCL told the high court that it will give an undertaking that it has obtained all the necessary permissions.
Links:
[1] http://admin.indiaenvironmentportal.org.in/news/can-cut-trees-bkc-metro-bombay-hc
[2] http://admin.indiaenvironmentportal.org.in/category/newspaper/asian-age-new-delhi
[3] http://admin.indiaenvironmentportal.org.in/category/thesaurus/maharashtra
[4] http://admin.indiaenvironmentportal.org.in/category/thesaurus/mumbai
[5] http://admin.indiaenvironmentportal.org.in/category/thesaurus/metro
[6] http://admin.indiaenvironmentportal.org.in/category/thesaurus/trees
[7] http://admin.indiaenvironmentportal.org.in/category/thesaurus/deforestation
[8] http://admin.indiaenvironmentportal.org.in/category/thesaurus/high-court
[9] http://admin.indiaenvironmentportal.org.in/category/thesaurus/forests