pencemaran (pollution)

http://www.youtube.com/watch?v=TwM9_3thvss

http://www.youtube.com/watch?v=wgSiq8dzhgA&feature=related

http://www.youtube.com/watch?v=tYBSMoKsuOY&feature=fvwrel

http://www.youtube.com/watch?v=8e3fvskBbOA&feature=related

http://www.youtube.com/watch?v=N-aza74V0-Y&feature=related

http://www.youtube.com/watch?v=LmnI2BFvml0&feature=related

http://www.youtube.com/watch?v=MyqBnQ2UeqA&feature=related