... (it's literally rubbish. solid and hazardous waste management ) confuse me too. e theory is great, but e calculations are not taught at all. but nvm, in tutorial i can pia. i hope. APMC (air pollution) is interesting, can learn abt climatology . maybe next time i can be a weatherlady. =p but i'm confused by e different types of inversions (dun ask me wad those are, i've no idea myself. >