Environmental Science

TERI University will be a very good option for you to pursue part time PhD. You may refer to following link for further details: http://www.teriuniversity.ac.in/phd-energy-and-environment

Eligibility criteria for M.Sc in environmental Science in majority of universities is graduation degree in Science such as Environmental Science/ Botany/ Zoology / Chemistry / Geology / Physiology / Microbiology / Agriculture etc.
You are not eligible for M.Sc because of your commerce background.

You may pursue M.Sc in environmental science in Bhartiyar University. The curriculum of Bhartiyar University is very good, and you will get to learn a lot.

Hi Sibtain, some of the best environmental science schools in the world include UC Berkely USA, Duke University USA, University of Oxford UK, Wageningen University and Research Center Netherlands, UBC Canada,University of Queensland Australia, Imperial College London, University of Montpellier France, Princeton University and Aarhus University Denmark. Narrow down your college choices carefully, visit the university websites and understand the requirements, most universities in US will not be too keen to accept a three years BS degree. Hope this helped. Please feel free to revert.