Everyone who is interested in this thread here,
Masters Degree in Environmental Science is a good option. I am sure you had some
"Intro to" or "Advanced" GIS in undergraduate program (B.S. or B.Sc in Environmental
Science). Currently if you are interested in doing grad. studies in environmental
field with some specilization in GIS, then try to contact professors related to Natural
Resources. I think this type of combination is there a lot in Natural Resources Department.
And the job market for Masters student with experience in GIS tools is very good.
Masters Degree in Environmental Engineering is a very good option if you have an Engineering
degree in your undergraduate. Environmental Engineering degree with a concentration in Water
Resources is high in demand currently. Besides this, water quality specialization is good but
not in demand as much as the first one. This is also a good option to take if you want to go
back someday in Nepal and do something.
Pay wise, graduates of Environmental Engineering is a bit higher than that of Environmental
Science generally. But the main point is "You should be doing what you want to do, and not go
for which one have better pay"