Deep Green Resistance stands with indigenous peoples in defense of their land, for both ethical and practical reasons. It's simply the right thing to do when people are threatened with theft of their traditional land base. It's also a highly effective way to preserve what's left of biodiversity and a living planet. Like any long-term member of a community, humans who know they depend on their land for sustenance and life foster its health to the benefit of everyone there.
The World Bank calculates that although indigenous people comprise just 4% of the global human population and live on just 12% of the land surface, their territory encompasses 80% of planetary biodiversity. Clearly they're doing a better job of fostering life than has any civilized culture. We can be most strategic in supporting these people in protection of this remaining biodiversity on their traditional lands.
The film series Standing on Sacred Ground explores these dynamics and looks at specific cultures and places in 4 DVDs. You can see multiple excerpts on Youtube, including "Sacred Sites and Biodiversity" featuring clips from Australia, Papua New Guinea, and Ethiopia.