Off on another venture | Gympie Politics | Local Politics in Gympie

STEVE Posselt, the environmentalist who paddled and dragged his kayak from Brisbane to Adelaide in 2007 to highlight the parlous state of the Murray-Darling river system, is gearing up for another long haul - this time from Brisbane down the coastline to Sydney.

Posselt, a 55-year-old retired civil engineer who spent more than 30 years in the water industry, is making this second epic journey to highlight concerns over the construction of the proposed Traveston Crossing dam on Queensland's Mary River - a dam that could endanger the survival of the prehistoric lungfish, which Posselt says outdates the dinosaur.

Now living at Alstonville after moving from Brisbane, the Grafton-born Posselt plans to leave Brisbane on Saturday, October 4, and arrive in Sydney on November 1. He hopes to present the signatures of thousands of dam opponents- many from members of the Save The Mary River group - to Minister for the Environment, Peter Garrett, in a bid to stop the dam's construction.

He describes the effects of the dam's construction as being "the worst thing I have seen in the water industry in my career".

"It would be much worse than the Franklin River Dam," he says, referring to the proposal to dam Tasmania's Franklin River, which was scrapped after massive protests in 1983.

Posselt's trip down the Darling and Murray rivers to Adelaide involved 2150km of paddling and 1080km of walking. "That gives a good idea of the state of the flow," he says.

Posselt doesn't hold back when he describes the state of the Darling. "It's f...ed!" he says.

"There's no way it can be fixed.

"We now have to decide which parts of it we want to live and which parts we want to die.

"It's quite depressing. I'm ashamed to be part of a civilisation that's done that.

"Almost everyone down the Darling thinks the answer is to dam the Clarence River and divert the water flow.

"My response was that, being born in Grafton, there's no way I'd let that happen."

Posselt says the Save The Mary River group is well-organised and there is overwhelming opposition to the Traveston Crossing Dam.

He acknowledges water shortage problems in south-east Queensland, but says the water from Traveston Crossing will not be needed for another 25 years.

The decision to press for a dam on the Mary River is political and not an engineering decision, Posselt said.

"The Queensland Government's attitude has disgusted me," he said, adding the dam would be a major emitter of greenhouse gases and it could lead to the extinction of the lungfish.

The website Native Fish Australia says the Australian lungfish belongs to "a very ancient group Sarcopterygii (fleshy finned fishes). Fossil members of this group have been dated at over 400 million years".

Similar lungfish fossils found in northern New South Wales have been dated at 100 million years, during the early Cretaceous Period, making this species a member of the oldest extant vertebrate genus, the website says.

"It was originally thought that this group of fishes were direct ancestors of amphibians, but now it is recognised that amphibians and lungfishes share a common ancestor.

Nevertheless, lungfishes evolved early in the history of vertebrates and do provide at least a small window into the distant past," it said.

Posselt says: "The lungfish lives for 100 years and is found nowhere else in the world. The Mary is its last full natural habitat.

"I think that once people understand, it (the dam) won't happen.

"It (extinction of the lungfish) will shame Australia." Posselt will have one simple message if and when he gets to meet Peter Garrett: "Extinction is forever".