"The government needs to actually do something so we don't have another Tasmanian Tiger situation."
That's the message from Macarthur wildlife warrior Ricardo Lonza following revelations from an upper house inquiry report that koalas could be extinct by 2050.
Mr Lonza said the report's findings were worrying.
"It's very concerning if that finding is accurate," he said.
"It will be good if the government actually puts some things in place to ensure the protection of koalas."
The upper house inquiry report stated that, without urgent government intervention, the state's koalas would become extinct before 2050.
The inquiry took a year to compile and the report was released on Tuesday. It found habitat loss was the biggest threat to NSW koala populations.
"There must be a significant increase in koala habitat protected from logging, mining, land clearing and urban development," Committee Chair Cate Faehrmann said in a statement on Tuesday.
Ms Faehrmann says the threatened species was in significant trouble before the unprecedented bushfire season which killed about 5000 koalas.
The committee also found climate change is severely impacting koalas, affecting quality of food and habitat and exacerbating droughts and bushfires.
The report found the NSW Koala Strategy to be ineffective in protecting enough areas for the marsupials to live.
It said the government's current estimate of 36,000 koalas living in the wild was outdated and unreliable.
Overall, the committee has made 42 recommendations to the NSW government.
"The evidence could not be more stark," Ms Faehrmann said.
"The only way our children's grandchildren will see a koala in the wild in NSW will be if the government acts upon the committee's recommendations."
Premier Gladys Berejiklian on Tuesday told reporters she was satisfied with the government's work in protecting koalas, including the funding of koala hospitals in Port Macquarie and Port Stephens.
"If we hadn't taken action, we would've seen those populations continue to diminish and I'm incredibly proud that we put tens of millions of dollars into protecting koalas across the state," Ms Berejiklian said.
"From memory it was an investment in excess of $60 million.
"I want to be the premier that saves our koala population into the future."
Mr Lonza - who assisted with the inquiry when it visited Campbelltown as part of the process - said it was important the government prevented the clearing of koala habitat for developments, maintained koala corridors and installed fencing, underpasses and overpasses along major roads like Appin Road.
NSW Labor has called for the government to urgently act on the inquiry's findings.
The party threw its support behind the report's recommendation that a koala national park be established along the Georges River.
Campbelltown MP Greg Warren said it was important to protect the local disease-free colony.
"The Campbelltown colony are loved by many members of our community," he said.
"I often speak to people who have been on long bushwalks through the Dharawal National Park in the hope of spotting one of the animals.
"We need to ensure our koalas not only survive but also thrive.
"This is truly a matter of life and death for our precious local colony."
Mr Lonza praised the work of Campbelltown Council in trying to protect the region's koalas and encouraged people to visit their website to learn more information.