Last Thursday, activists from the "Just stop oil" network glued themselves to the frame of a painting at an art museum in Glasgow, reports the BBC.
On Monday, the same thing happened at the National Gallery, when two activists glued themselves to the painting "Höskrindan".
The painting is 200 years old and shows how some horses pull a haystack in the English countryside.
The activists taped a new picture on top of the board, which according to them shows what the landscape will look like after a climate collapse.
The activists also glued themselves to the frame and sat there for a few hours before being arrested by police.
The painting suffered minor damage which, however, could be quickly repaired, according to the museum.
"Art is important and should be preserved for future generations, but what role does art play when people are starving?"
declared the activists.
Wants oil projects to end
On Tuesday, activists glued themselves to a copy of da Vinci's 15th-century painting "The Last Supper" at London's Royal Academy of Arts.
The activists spray-painted the text "No new oil" next to the board, writes the news agency AP.
According to the London Police Department, three men and two women were arrested on suspicion of vandalism.
The organization "Just Stop Oil" wants the British government to stop supporting new oil and gas projects and has staged several eye-catching protests in the past week.