Peru has threatened legal action against Greenpeace activists it has accused of causing “irreparable damage” to a UNESCO world heritage site. Archaeologists say footprints left by the activists could remain in the desert ground for decades. Al Jazeera's David Mercer reports.<br /><br />Subscribe to our channel http://bit.ly/AJSubscribe<br />Follow us on Twitter https://twitter.com/AJEnglish<br />Find us on Facebook https://www.facebook.com/aljazeera<br />Check our website http://www.aljazeera.com/
