Wentworth Group of Concerned Scientists estimates $7.3bn a year for 30 years could avoid most extinctions, repair soils and restore rivers

For the first time scientists, governance and business leaders have produced a dollar estimate of what it would take to fix Australia’s environment.

They set out 24 actions which, if followed, could “avoid most extinctions and recover almost all threatened species”, repair the productive base of agricultural soils and fix over-allocated and fragmented river systems.

The dollar figure – $7.3bn annually for the next 30 years – is less than two-thirds of the federal government’s reported annual expenditure on fossil fuel subsidies.

“The cost is less than 0.3% of our GDP. Given that nearly half of our GDP depends on nature, that’s a pretty sound investment,” the University of Queensland professor Martine Maron told the National Press Club on Wednesday.

$7.3bn annually for the next 30 years – is less than two-thirds of the federal government’s reported annual expenditure on fossil fuel subsidies.

Maron is part of the Wentworth Group of Concerned Scientists, which spent six years developing its Blueprint to Repair Australian Landscapes.

She said Australia’s spectacular and unique landscapes and beloved wildlife were a drawcard for domestic and international tourists alike, bringing billions of dollars into the Australian economy every year.

But she said many Australians did not realise that “all of this is genuinely under threat”.

“You’re all familiar with the ASX? Well, we have an index that tracks how our threatened species are going too,” she said.

“It’s called the TSX – the Threatened Species Index – and it shows that populations of our threatened species have declined 60% since 2000.”

The blueprint puts forward a national case for repairing degraded landscapes and taking practical action at a continental scale.

If adopted, the Wentworth Group said the measures it proposed “could repair much of the past two centuries of degradation”.

The actions include protection and restoration of threatened species habitat; addressing threats such as invasive species; expanding the use of Indigenous fire management practices; work to improve the physical and chemical condition of soils; and returning the Murray Darling Basin to environmentally sustainable levels of surface water extraction through measures including strategic water licence buybacks.

“The cost is less than 0.3% of our GDP. Given that nearly half of our GDP depends on nature, that’s a pretty sound investment,”

The group said it was possible to return Australia’s native vegetation to at least 30% of its pre-1750 extent by restoring 13 million hectares of degraded ecosystems – much of that on non-prime agricultural land – and incentivising landholders to retire non-prime agricultural land and set it aside for nature conservation. They said this alone would abate almost one billion tonnes of carbon dioxide equivalent and produce $16-$34bn in carbon market revenue to landholders within 30 years.

Professor of geography at the Australian National University Jamie Pittock said Australia needed to recognise that the transition to net zero emissions was also an opportunity to repair the country’s landscapes at scale.

“The blueprint shows the repair actions will contribute to Australia meeting our international commitments on climate change and biodiversity, at the same time as boosting the economy through increasing regional employment, improving agricultural productivity, and building resilience to climate change,” he said.

“The key finding of our blueprint is that Australians don’t have to choose. We can afford to have both a healthy environment and a productive economy.”

The group estimates that after capital investment of $7.3bn annually for 30 years about $250m a year would be required to maintain the environmental outcomes.

The blueprint has been released at a time when the Albanese government is under pressure to deliver its full reform package for Australia’s national environmental laws.

Legislation is before parliament to establish a national environment protection agency and a new agency for environmental information.

But a broader package of legislation, including new national environmental standards, to fix Australia’s failing system of environmental protections has been delayed.

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