Hey prathiba patil! 

Yes an environmentalist is a very good career! If you believe in the words nature to it's purest form then go for it! 

Colleges that are the best to study environmental studies include- 

Al ameer institute of Management and technology andhrapradesh

Assam professional college Assam

Dayanand college haryana

Mount Carmel college Bangalore

Cochin university of science and technology kerala

Ferguson college Maharashtra