Greta Thunberg has apologised for saying world leaders should be "put against the wall" in a speech.

Axar.az reports citing BBC.

The teenage climate activist made the comment while addressing a Fridays For Future protest in Turin, Italy.

In English the phrase is associated with execution by firing squad, but Ms Thunberg said it had a different meaning in her native language Swedish.

"That's what happens when you improvise speeches in a second language," she added on Saturday.

Ms Thunberg was speaking in Turin after attending the UN climate summit COP25 in the Spanish capital Madrid.