Young Germans put environment at centre of political debate

From Berlin to Munich, thousands of German children are skipping school every Friday to march against climate change. But "Fridays for Future", as it's called, is only the tip of the iceberg. Environmental fears have galvanised young people into action, with NGOs seeing a surge in volunteers. To the surprise of many adults, German children have done in a matter of months what politicians have failed to do for decades: make climate policy a top priority. Our correspondents report.