Well Brit, it had nothing to do with what they were saying, but the fact that they felt they needed to punctuate their sentences by throwing rocks at the police.

"But last night violence broke out when tens of thousands of people – some dressed as penguins and polar bears, carrying signs saying: "Save the humans" – took to the streets. The march had been organised to urge conference delegates to work out a binding deal to tackle climate change but was marred when a group of protesters threw bricks at police."