31.   The pollution caused the plant to be closed by Puncak Niaga.

32.   The studies will examine how environmental changes such as habitat destruction, global warming and pollution may cause new diseases to emerge and old ones to become more deadly.

33.   Jaw said he suspected the cancer was caused by pollution.

34.   Other subjects likely to come up at the conference include the mysterious deaths of whales which might be caused by pollution.

35.   Scientists are at a loss to identify the virus, although some suspect it could have been caused by pollution from the prawn farms themselves.