Beginning at the 2:19 mark. PopSugar.com summarizes it:
I got to meet him last year when he marched with the Indigenous Bloc of the Peoples Climate March in NYC. Here is a photo I took of him standing with our folks in that march, holding a banner from IEN, Indigenous Environmental Network.
If you look closely former congressman Dennis Kucinich and Mark Ruffalo are in this photo as well--standing with many other frontline Indigenous leaders. ;-)
Much love to Leo. He walks his talk. And I hella respect that.
Comment: For more on the subject, see Indians at Previous Oscar Ceremonies and All About Sacheen Littlefeather.