I know we are digressing, but:
The worst environmental problem the Northern territory faces is the slow march of the introduced Cane Toad into Kakadu National Park.
Cane toads themselves were a biological control introduced into Queensland in 1935 against beetle grubs that were affecting sugar cane crops. The toads did not control the grubs, but have since flourished and extended their range throughout much of Queensland and the Northern Territory. The fauna think they are a local frog, eat them and die from the poison. (Each cane toad can easily kill a croc.)
The Australian government have effectively done nothing about it.
If our overseas PPrune friends want to see the World Heritage Listed Kakadu National Park as featured on Croc Dundee, I suggest you start packing. It won’t be around much longer.
http://www.abc.net.au/science/news/stories/s262763.htm