Olivia Newton-John and Jimmy Barnes are among several celebrities who have added their star power to the fight to stop a NSW quarry expansion.
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The entertainment legends have called for Federal Environment Minister Sussan Ley to save 52 hectares of koala breeding habitat in Port Stephens, north of Newcastle, earmarked for the quarry.
The decision on the expansion was due at the start of September but was pushed back to October after a report commissioned by the Brandy Hill and Seaham Action Group indicated the expansion would create a significant barrier to koala movements.
"It is not often a grassroots campaign run in a regional area of Australia gets noticed by high profile Australians," campaign manager Victoria Jack said.
"It is quite powerful."
The group reached out to several celebrities who had previously aligned themselves with environmental campaigns, or who had links with the local area. The campaign had already garnered interest across the globe with messages coming in from Italy, Germany, Ireland, Israel and even South Africa, but the star power people like Newton-John brought to the cause was priceless Ms Jack said.
"We feel like it is a real moment in time and as a nation Australians are saying that we are no longer willing to accept the destruction of koala habitat."
The singer and actress, known for her role in Grease the musical, called for the preservation of koala habitat, specifically calling out the Port Stephens land earmarked for the controversial quarry expansion, and asked MP Ley to refuse the permit.
"Koalas have always been very special to me," Ms Newton-John said in her video message.
"Because of the loss of habitat through drought and of course fires, and climate change and land clearing, our koalas are facing extinction by 2050.
Meanwhile Barnes used his social channels to further spread the message.
"First full day of rehearsals for my first gig in [seven] months," he posted.
"Meanwhile the poor koalas are copping it again, you'd think after last year's bushfires, bulldozing 52 hectares of their habitat wouldn't be on anyone's radar."
Earlier this week actress Magda Szubanski joined the call to stop the quarry. On Monday she used her Twitter account to encourage her followers to contact the minister.
Shayna Blaze from popular renovation television show The Block also joined the campaign this week.
Construction materials company Hanson operates the Brandy Hill Quarry. The company planned to expand the operation, with a proposal to more than double extraction rates to 1.5 million tonnes of rock a year and almost quadruple the area being quarried.
The expansion was approved by the state government in July, but is awaiting the federal minister's final decision. Ms Jack said the campaign and its celebrity partnerships would only be ramped up as the deadline creeped closer.