Rebecca Stott responds to the latest report from the Intergovernmental Panel on Climate Change.

And she reflects on how our ancestors dealt with dramatic weather events - and the gods they believed were responsible.

"Our ancestors would have sacrificed everything they owned to appease those gods.....they would have prayed together, sacrificed together".

"But what," she wonders, "will we in the west sacrifice to save our species? Our cars? Our meat-eating? Our air-conditioning? Our foreign holidays?"

Producer: Adele Armstrong