More than 50 authors due to appear at the Edinburgh International Book Festival have called on the event to drop Baillie Gifford as a sponsor if the firm continues to invest in fossil fuels.
Thunberg said she could not "attend an event which receives sponsorship from Baillie Gifford, who invest heavily in the fossil fuel industry."
The book festival will this year host climate activists including Greta Thunberg, but its sponsor, Baillie Gifford, has significant investments in firms involved in the coal, oil and gas sectors.
The Scottish Government gave £8.6m of green funding to a coal firm's biomass project.
Glasgow City Council has spent almost £10m on agency workers to empty bins and deal with recycling in the last five years, we can reveal.
Ferret Fact Service explains some of the climate change jargon you may hear during COP26.
Ferret Fact Service looks at the Scottish Government's climate targets.
The public sector in Scotland is being urged to step up its efforts to tackle the climate emergency, after a survey revealed that most government bodies have done little or nothing in response.
The Scottish Government has quietly halved funding for communities tackling climate pollution, depriving 43 local projects of grants and putting people out of work.