Hello, we are Interdisciplinary Programs Students' Union, a society that serve the students studying IPO programs in HKUST.
1. In fact CBME and EVMT are completely different in nature.
CBME focus on processing, thermodynamics, fluids and has a lot of laboratory work. In other words, it is very technical. Advantage is that you can become a professional, qualified Engineer with License after you studied CBME. However, the drawback is that CBME industry is not very vigorous in Hong Kong. Maybe you can take a look on this pdf, which includes the courses you have to take for CBME:
http://publish.ust.hk/prog_crs_ar/pdf/ug_4y/cbme.pdf
EVMT on the other hand aims to train Environmental Leader with management and technical skills as environment becomes more and more concerned in Business in the future. Hence, EVMT students have to take Environmental Science courses, Business courses and also some courses about technology. In other words, EVMT is more diversified and it is also full of presentation and soft skill training. This is a special program that only offered by UST and this unique characteristic and diversified learning are definitely the advantage. However, drawback is that graduates cannot apply the liense likes CBME and a become professional Engineer. Here is the courses that a EVMT student has to take:
http://publish.ust.hk/prog_crs_ar/pdf/ug_4y/evmt.pdf
2. To choose EVMT is of course more difficult than choosing CBME. EVMT recruits around 30 students each year and to enter EVMT, you better keep a GPA of 3.3 or even 3.5 in the first year. Since students from ALL schools can choose EVMT as their major in year 2, maybe you can enter School of Engineering of UST first.
3. To choose which CBME or EVMT really depends on your interest. Career is never a problem if you really love the subject you study and have incentive to learn.
Hope I can help you la
If you have further problems can still pm me or ask here!