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In the , the Victorian government designated 12 areas, covering 17 municipalities around Melbourne, as land set aside for recreation, conservation, farming and resource utilization purposes.

These areas are known as .

Over the past 60 years, the world has changed. The rapid population , along with the subsequent as increasingly scarce natural environments disappear, are particularly important to the future of Green Wedges.

While these areas have mostly been retained, our argues that the current legislation defining and protecting Green Wedges is in urgent need of updating as it's not keeping pace with threats to these important areas of biodiversity and high-value ecosystems.

Pressure of growth

The total population of Greater Melbourne increased by a quarter between 2006 and 2016, between 2011 and 2016—a very high rate when compared with cities in other industrialized countries.

This has put increased pressure on the ability of Green Wedges to meet the demands of multiple uses, especially during the COVID-19 pandemic, as many people for their health and well-being, and are .

Two other issues have coincided with this added pressure—the first is environmental loss.

Australia has the highest extinction rate of mammals in the world and is the . This is due to land clearing and climate change, with the associated increase in .

Despite this rate of extinction, very little protection is offered to Australian flora and fauna.

There are 194 animals, 53 invertebrates and 380 plants listed as threatened under the , most of which don't appear to have a protection plan.

On top of this, many species have been left outside this Act—dangling on . And these lists suggest that four-fifths of Victoria's threatened flora and 284 threatened species of fauna remain outside the Act.

Ironically, this extinction crisis is happening at the same time as we're seeing an increasing recognition of the for the health and well-being and, indeed, the survival of humanity.

Along with the many ecosystem services that our natural environment provides—like trees that improve our air quality, undertake —there are many positive impacts as a result of people's interaction with nature. These include improving , reducing , and even improvements in .

So, where Green Wedge areas are at risk of being lost to another use, particularly those with high levels of biodiversity that also have significant biolinks (wildlife corridors that connect pockets of native vegetation), there should be very strong grounds for comprehensive protection that rules out that alternative use.

High-value ecosystems

Irreversibility is at stake here.

Replanting new trees and understory is important but doesn't substitute for a 300-year-old habitat. And these threats to high biodiversity areas are happening here in Greater Melbourne.

Hillview Quarries, owned and operated by The RE Ross Trust, recently applied for an for a for owned land within a Green Wedge area.

The new quarry would mean the clearing of up to 38 hectares of native vegetation in the heart of that represent the last 18% of intact native vegetation on the Mornington Peninsula.

The quarry would be bordered on two sides by the .

A limited ecological assessment of the proposed quarry area has identified that at least 28 endangered species are on the site, six listed under the , including the , which is critically endangered.

The proposed site is also an important koala habitat and breeding ground and this kind of significant habitat loss is likely to .

The land has what are probably the oldest eucalyptus trees on the Peninsula, that provide important nesting locations for the .

And, in terms of plants in the area, there are many native orchids, some not yet formally catalogued, and the land is rich in fungi—some of which isn't yet officially identified.

Conservation of these kinds of high-value ecosystems must be ensured within the Green Wedges.

There should be no trade-off here. Ancient trees and complex habitats that are home to particular species simply cannot be offset or replanted elsewhere.

Future demand and supply

Conservation aside, there are also other arguments against a narrow and inappropriate use of land in the Green Wedges.

The proposed quarry is expected to . Meanwhile, growing tourism and lifestyle activities in the region—many of which depend on nature—generate around .

Some of these jobs would likely be lost should an industrial-scale quarry go ahead in a highly visible part of the Arthurs Seat Escarpment, particularly with associated pollution, loss of underground water, noise and a steady army of quarry traffic.

The Victorian Government's strategic assessment of demonstrates that Victoria has an ample supply of granite for the remainder of this century, without the proposed new quarry. So 'need' isn't an issue here.

The quarry site would be of much more value, both now and in the future, if it was added to the Arthurs Seat State Park as a natural resource for generations of Victorians and visitors.

This would also support further growth in tourism, provide a natural asset for Melbourne residents, and remain an important site for biodiversity and conservation.

While this is just one specific example, ensuring the future biodiversity values of Melbourne's Green Wedges and updating the legislation to prioritize their importance for the health and well-being of the Melbourne population, is of prime importance.

The protection of irreplaceable natural areas isn't an issue of trade-offs if humans and other species are to survive our climate futures.