Hello Aspirant,
Environment science and environment management both the subjects are relevance in its own area.
Here I'm sharing a link from which you can get some idea about it.
https://www.careers360.com/environment-management-course
And another link is which you can check also.

https://www.google.com/amp/s/www.careers360.com/articles/9934-environmental-sciences/amp

Hope it helps
All the best!

hello Anand, environmental science is basically the study of surroundings and the basic terminology we use for environmental studies. Environment management is a part of environmental studies. The career opportunities for management has more of planning and desk work. whereas, environmental science studies require proper knowledge and research work on environmental changes, conditions, climate weather etc. The job opportunities are quite better in management.