Nature and EnvironmentControversial coalTo view this video please enable JavaScript, and consider upgrading to a web browser that supports HTML5 videoNature and Environment06/15/2017June 15, 2017The open-pit mine in Hambach is one of Europe's largest, but activists want to shut it down. They're taking to the trees to pressure the mine's operators into ceasing operations.https://p.dw.com/p/2ebr2Advertisement