Climate change activist Greta Thunberg says she will never buy new clothes again.
The 18-year-old revealed that she asks friends if they have clothes they don't need anymore rather than purchase something brand new.
She was speaking to the Sunday Times magazine to mark her birthday.
She told the publication: "I don't need new clothes. I know people who have clothes, so I would ask them if I could borrow them or if they have something they don't need anymore.
"The worst-case scenario, I guess I'll buy second-hand."
But while she claimed she had made changes to her life, the teen said she didn't judge others who lived differently to her, though understood why celebrities could come under fire for apparent hypocrisy.
She added: "I'm not telling anyone else what to do, but there is a risk when you are vocal about these things and don't practise as you preach, then you will become criticised for that and what you are saying won't be taken seriously."
Greta also opened up about the pressure her fame had put on her family, with members receiving death threats.
She told the publication that while she didn't care what people said about her, 'when it impacts the people around you, then it becomes something else'.
Last month, Jacinda Ardern won praise in New Zealand and around the world for declaring a climate emergency in parliament.
However, Greta called the declaration virtue signalling that won't really achieve much. In a tweet, she quoted an article from New Zealand's Newsroom that outlined what the efforts will mean in real terms.
The country's climate change minister, James Shaw, has hit back at Greta's criticism.
"Greta Thunberg is essentially pointing out what we already know: that we have a long way to go to narrow the gap between what our emissions are right now, and what they need to be in the future," he said, according to the New Zealand Herald.
"We are working on this as quickly as we can and the declaration of a climate emergency is actually helping - because now every part of government is clear that action to cut emissions is a priority.
"This is what climate emergency declaration should do. It is not an end in itself, rather it signals our intent to do everything we can to tackle the climate crisis and build a better, safer future for our kids and grandkids."
However, the teenager did praise Joe Biden's bid to re-join the Paris Climate Agreement when he assumes the White House.
Speaking to CNN, the 18-year-old is confident a Biden Administration will take the threat of climate change more seriously than Donald Trump's.
"I am more than happy that the US will rejoin the Paris agreement; that is absolutely crucial," Thunberg said. "We need to communicate the situation where we are, we need to understand that we are facing an emergency.
"We need to change the social narrative around this, and of course as young people, we would really appreciate it if we stopped only talking about future, distant hypothetical goals and targets, and start focusing on what we need to do now."