"It's incredibly concerning," Australian Conservation Foundation program manager Basha Stasak says.

"And it's something that, unfortunately, the federal government isn't paying enough attention to."

It's an assessment backed by heavy-hitters in the field.

The University of Melbourne's Professor Brendan Wintle describes Australia as a world leader in extinctions and notes that since 1985, threatened bird populations have declined at least 50 per cent.

"We're in a really dreadful situation," he told a Senate committee last month. "We really need positive change."

The Australian Academy of Science's Craig Moritz says there's an opportunity for government to "do something really important for the country" but not taking it will have more than immediate consequences.

Continuing to endanger native fauna will eventually damage the economy because developers, farmers and miners "won't be able to do anything without tripping over threatened species", he told the same inquiry.

For the World Wildlife Fund, the point of no return is fast approaching even for one of Australia's most iconic animals.

It argues the koala's future will be decided by actions over the next five years.

"That's how little time we have left to save them. If we choose business as usual, koalas will go extinct in our lifetime," the fund says.

Even the man appointed by the federal government to undertake a once-in-a-decade review of Australia's environmental protection laws, businessman Graeme Samuel, found the framework unfit for purpose.

He concluded the nation's environmental trajectory was simply unsustainable.

A trickle of improvement has since emerged, Ms Stasak notes. But not enough.

Australia is reportedly responsible for the extinction of 30 per cent of the world's modern mammals.

Among them are the brush-tailed bettong, buff-nosed rat kangaroo, central hare wallaby, western barred bandicoot and, of course, the Tasmanian tiger.

Fifty-four species have vanished over the past two centuries and Australia lists 518 threatened species.

Of the 20 facing extinction by 2040 are Victoria's faunal emblem, the leadbeater's possum, and the rare swift parrot, which migrates between Tasmanian and South Australia.

But the koala and the platypus aren't far behind.

The WWF estimates more than 7.7 million hectares of threatened species' habitat has been destroyed since 1999. A further 12.6 million ha was scorched by the Black Summer bushfires.

Professor Samuel set a path to improve protections in January with support from most stakeholders. It involved tougher national environmental standards, an independent watchdog and a process to cut red tape.

"When it comes down to it, we had an independent review saying very clearly that the act doesn't work, the environment is declining and we need fundamental reform," Ms Basak said.

"But the government has, for all intents and purposes, just disregarded that. It hasn't responded to the review, hasn't picked up the recommendations and continues to push the idea of devolving environmental powers to the states."

Environment Minister Sussan Ley has formulated a new decade-long strategy made up of two five-year action plans and supported by $57 million in funding.

Priority areas are mitigating new and established threats, conserving habitat, emergency preparedness and response, as well as climate change adaption and resilience.

"Our human footprint, feral pests and weeds, our changing climate and biosecurity hazards present an enormous threat to a growing range of native species," she said last month.

"This strategy is at the heart of caring for our country, for its biodiversity and for our future."

It will pinpoint plant and animal species and identify places that need conservation support.

The ACF welcomes the package but estimates $1.69 billion a year is needed to adequately tackle the nation's extinction threat.

Australian Associated Press