Hit them where it hurts - in the wallet. The government of Peru should sue Greenpeace, and the individuals who did this personally, in U.S. courts and whatever other venues are appropriate. This would be in addition to any criminal penalties. I should think damages would be almost incalculable.
Exactly...Make them pay to remove every footprint and the disturbing of the landscape plus punitive damages.
That could amount to many years of donations to this criminal enterprise.