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Make them clean up the site — with their tongues. That’s right, clean up all the paint with their tongues and replace every pebble to its original position with their tongues. THEN send them to jail for six years. Arrogant b***ards.

They damaged the area merely by walking on it. The area is in a high desert that gets very little rain and I think if not mistaken, not even much wind. There is a very thin layer of dark crust covering a much lighter colored ground (sand?) underneath. That is how the people who created the lines created them, sort of like etching. Walking around on the fragile surface exposes the lighter material, leaving behind footprints or scuff marks that can last hundreds of years. It is not something easily fixed or restored. They were also trespassing as Peru restricts access to the area only granting permission to scientists/archeologists in very rare cases and I think even then they have to wear special shoes and take other precautions as not to damage the fragile surface surrounding the lines.

http://news.nationalgeographic.com/news/2014/12/141212-nazca-lines-greenpeace-archaeology-science/

Careful removal of the dark varnished crust from the lighter-colored desert floor created the lines, called geoglyphs, made more than 1,500 years ago by ancient Andean people. Native Americans as far north as California used a similar method for creating desert drawings, most famously the Blythe "Intaglios," depicting large human figures.

Desert varnishes form very slowly, in some cases over tens of thousands of years. How these coatings, only about as thick as a sheet of paper, grow on desert rocks is poorly understood, according to Joseph McAuliffe of the Arizona-Sonora Desert Museum. Bacteria baking in the desert sun may actually concentrate darker minerals on exposed rock surfaces, he suggests, with the varnish essentially serving as a microbial sunscreen.

The Greenpeace activists drew Peru's ire as much for potential damage done to this delicate desert surface as for trespassing. The lines "are absolutely fragile," Peru's Deputy Culture Minister Luis Jaime Castillo told the Guardian: "You walk there and the footprint is going to last hundreds or thousands of years."

That’s right, clean up all the paint with their tongues and replace every pebble to its original position with their tongues

At least they didn’t use paint but what looks like vinyl cut out letters (and does anyone else see the irony in that?)

Make them clean up the site — with their tongues. That’s right, clean up all the paint with their tongues and replace every pebble to its original position with their tongues. THEN send them to jail for six years. Arrogant b***ards.

I don't think even Greenpeace would be stupid enough to use paint. Looks like plastic. Probably already removed.
But rolling rocks around with their tongues sounds good.