in the audience in cottbus that night was benedikt kaiser, another influential figure.os. he's accused the bbc of rehashing old stories. became more and more right wing extremist... this spy chief claims that extremism within the afd poses a risk to democracy. when i'm speaking about a german oak, a big, strong old tree, it can take a blizzard, it can take a storm, but once you have an enemy that goes for the roots, and that's exactly what's happening right now, going for the roots of our democracy, it's very dangerous because it goes to the vital parts of our democracy. the afd says it's being smeared by a biased establishment. and as the country builds towards regional and eu elections, this isn't a fringe movement, but one trying to go mainstream. jessica parker, bbc news, in brandenburg. new figures suggest more global temperature records are being broken. the eu climate service, copernicus, says last month was the warmest april on record. and bbc analysis has found that in the past year, the world's oceans have broken temperature records too, having a huge impact o