WWII bunkers, thugs and aliens, and calving glaciers

This week in the Planet Earth Podcast, why weathermen are using a converted World War II bunker to monitor clouds; how thug species such as bramble, nettle and bracken can be just as damaging to woodlands as alien plants; and why scientists are going to Greenland to deploy a network of sensors in some of the country's glaciers. Like this podcast? Please help us by supporting the Naked Scientists