Diploma

Hi Tanveer,
A Diploma, in general, refers to certifications issued by colleges, institutions and universities to testify that a student has successfully completed the course. A diploma is of a shorter duration than a degree course and carries less weight and significance in the minds of the employers as well. In general, it is taken as an opportunity to add a feather in one's cap to be ahead of those who have only completed their undergraduate courses.
A graduate diploma is a certification that one can obtain only after completing his undergraduate level degree course. Diploma courses are not only of shorter duration than a full-time degree course, they also cost much less than a degree course. One is able to add a specialization against his name that is helpful in furthering one's career when he completes a graduate diploma
PG Diploma is a qualification awarded after bachelor's degree course.
A graduate diploma acts as a continuation of undergraduate study, therefore assisting the graduate in advancing his or her knowledge in a particular area of study. The postgraduate Diploma on the other hand, goes beyond the B.Sc / B.Com etc. level and can be considered instead of a full-time M.Sc / M.Com etc; some students will pursue a postgraduate diploma prior to doing their masters, so it can be used as a building block towards the Masters.

Hi,
After completing PG Diploma in environmental studies, you will have multiple career options. They can work with different government departments and agencies like:
1. Forest and environment
2. Pollution control board
3. Urban planning
4. Industries
5. Water resources and agriculture, etc.
NGOs working for environmental protection, so it will be a good option for environmental studies. Private industries and firms also absorb a large chunk of environmental scientists to suggest proper methods and process:
Waste treatment industries, refineries, distilleries, mines, fertilizer plants, food processing industries and textile mills employ environmental scientists. Environmental scientists also can be involved in research activities in public and private sector institutions. Environmental scientists also can seek employment in media as environment journalists. Teaching in colleges, universities is also a good option available for environmental scientists.