As you want to get the details of career after M.Sc Environmental Science in India so here is the information of the same for you:

M.Sc. Environment Science Job Types

Wildlife Film - Maker
Environment Photographer
Environment Journalist
Forest Carbon Specialist
Research Assistant
Director - Waste Management
Lecturer & Professor
Research Fellow
Senior Catastrophe Risk Modeller
Senior Programme Officer
Environmental Technician
Product Manager - Environmental Health & Safety

Some job profiles:
Research Assistant
Wildlife Film-maker
Environment Journalists
Forest Carbon Specialist
Conservation Hydrologist
Senior Programme Officer
Environment Photographer
Director of Waste Management
Senior Catastrophe Risk Modeller