Greta Thunberg has called on banks to "stop funding our destruction", ahead of the UN COP26 climate summit.
The teenage Swedish climate activist is in London to take part in protests demanding the financial system stops funding fossil fuel projects.
She told the BBC's Andrew Marr that "change is possible" at the summit, if pressure on politicians is maintained.
But she added she has not been "officially" invited to speak at the event in Glasgow.
The demonstrations against investment in fossil fuel projects come as world leaders gather in the Scottish city ahead of COP26's opening on Sunday.
The protest in London is part of a series taking place on Friday at financial centres around the world, including New York, San Francisco and Nairobi.
Campaigners are calling on banks not to lend money to companies and projects that use fossil fuels such as coal, oil and natural gas.
The COP26 conference will see more than 200 countries asked to set out their plans to cut greenhouse gas emissions by 2030.
The summit is seen as crucial if countries are to implement a pledge made in 2015 keep global warming "well below" 2C above pre-industrial levels.
As the host country, the UK is under pressure to get them to make ambitious commitments to reduce the greenhouse gases they emit.
Ms Thunberg confirmed this week she will travel to Glasgow to join a "climate strike" taking place during the summit.
But asked whether she had been asked to speak at the event, she replied: "I don't know. It's very unclear. Not, like, officially."
In its official summit programme, the UK said it wanted to "elevate youth voices" during a series of events arranged on one of the summit days alongside the UN's official youth climate arm.
There will also be a discussion on the outcomes of September's Youth4Climate summit in Milan, where Ms Thunberg delivered a speech in which she mocked politicians' use of climate slogans.
SOURCE: BBC NEWS
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