Extinction Rebellion has blocked the gates to the Ineos oil refinery in Grangemouth by forming a chain to the entrance and positioning two boats in the way.
The group claim that Ineos is the biggest climate polluter in Scotland – and Ineos want to expand further.
Annie Lane, 26, a campaigner from Glasgow, said: “Ineos Grangemouth is Scotland’s largest climate polluter. It is Scotland’s only crude oil refinery.
“It also stores fracked gas from the States. Given the widely assumed ‘ban’ on fracking in Scotland, for fracked gas which harms communities worldwide to still be processed here is outrageously hypocritical.
“We are here to expose the climate destruction that Ineos is causing. We are running out of time, with the climate crisis affecting so many in the global south already.”
Campaigners held up banners stating “No Future in Fossil Fuels” and “Climate Justice Social Justice”.
A demonstration is also taking place outside the Ineos headquarters in London.
The petrochemical manufacturer said it has reduced emissions by 37% from 2009-2019 at its Grangemouth site.