Foam or fog, the same signals for restricted visibility would apply i suppose. (g) Note, the article did not specifically refer to the presence of decaying wombat carcasses, although it is difficult for this reader to presuppose a wombat not being involved.
Note also the eco-freaks response to the article. Anything they are unfamiliar with must be abnormal, man-caused, and eradicated. If the Aussie government get's out of this with spending anything less than 1 million studying and investigating the taxpayer's should count themselves lucky.
Personally, I'm not ruling out the possibility of our wombat and his cappacino machine being involved in some way. If any traces of Sambuca are found my suspicions will reach the level of metaphysical certitude.
“Scientists are people who build the Brooklyn Bridge and then buy it.”
Wm. F. Buckley, Jr.