Thirteen years later, her commitment to living meat-free hasn't wavered, nor has her dedication to Mother Earth.

The flame-haired St Mary's College student will address some of the world's most influential conservationists in Sydney on Friday after winning a speaking spot at the prestigious International Union for Conservation of Nature World Parks Congress.

The congress is backed by the United Nations and aims to set a decade-long agenda for conserving the world's protected areas.

Meg is one of six students selected to make a presentation at the conference following a competition by the climate change movement, 1 Million Women.

"[The congress] only happens every 10 years and this year it happens to be in Sydney, and I happen to be the right age [to enter the competition to speak]," Meg said.

"It will be so awesome for me to talk to people who are like-minded but also have the experience behind them.

"I hope doing this will open up more doors for saving the environment, because that's my big goal."

Meg is president of St Mary's conservation club. When she finishes high school she hopes to spend a month in Burma working with orangutans.

"I've travelled a lot and I know how precious and diverse the planet is," she said. "We're here, the younger generation, and we care."