America's tree sitters risk lives on the front line

In the hills on the border of Virginia and West Virginia protesters - mainly women - are defying police and energy companies in non-violent environmental activism

Way out in the Appalachian hills, on the line between Virginia and West Virginia, after an hour-long backwoods hike up Peters Mountain, an orderly clutch of tents were surrounded by a plastic yellow ribbon that read, "police line do not cross".

Past that, a woman sat on top of a 50ft pole.