Climate change is one of the most important global environmental challenges that affect all the natural ecosystems of the world. Due to the fragile environment, mountain ecosystems are the most vulnerable to the impact of climate change. Mountains have been recognized as important ecosystems by the Convention on Biological Diversity. Arunachal Pradesh is a predominantly mountainous state and is home to many endemic, endangered and threatened species, as well as to the indigenous people, who are dependent on its biological resources.