. >> quena raymi is a very special festival held once a yeaear in e peruvian andes. it's a tree-planting ceremony attended by over 200 men, women , and children from various villages in the area. once the festivities are over, they begin their hike up the mountain, carrying shovels and other tools, and provisions with them. plus infants and the saplings -- even the llamas come along. their two-hour trek takes them to an altitude of over 4000 meters above sea-level. they follow anicent paths once used by their ancestors. the incas lived in harmony with their environment. for today's population, the idea is to give back what they have taken from nature. the past few centuries have seen the area almlmost completely deforested, with no effort to replenish the devastated woodlands. these people are the first generation to recognize that something has to change. hermogenes, one of the village leaders, is here with his family. >> it's hard to dig holes in the ground here. you might dislodge rocks, you can never rule out accidents. you have to be extremely careful. there are