lu zhi is a conservation biologist at peking university.she's been working with tibetans in this area for many years. translator: during the 1990s, when i went to the tibetan area for the first time, i saw something that really surprised me. there was a lot of logging going on, but in some areas, the wild animals were not afraid of people. and there were very old trees, 600 or 700 years old. the ancient forest was preserved. i asked the local people how is this possible? people said this is our sacred mountain. this was a big shock to me. just the concept of sacred mountain was good enough to preserve the resources. it's more powerful than the law or the preaching of scientists. today the system is still functioning. in the core area, nothing should be touched. then in a broader area, killing is not allowed. no living beings should be harmed. we did a survey on birds, and we discovered that wherever the belief in sacred mountains is strong, there is greater biodiversity. so this shows scientifically the environmental value of sacred mountai