Every Thursday, a new episode of Living Planet brings you environment stories from around the world, digging deeper into topics that touch our lives every day. The prize-winning, weekly half-hour radio magazine and podcast is produced by Deutsche Welle, Germany's international broadcaster - visit dw.com/environment for more.
Ahead of the UN climate summit in Paris key issues remain on the negotiating table, European cities find novel ways to reduce their carbon footprint, and all aboard the climate train.