Tall later co-founded the Native Resource Coalition, dedicated to research and education for the Lakota people on issues of land, health, and the environment. When the AMCOR Company approached the tribal council about locating a 5,000 acre landfill and incinerator on the reservation, Tall vehemently opposed and began to speak out against the project. When Tall learned that tribes across the country had been similarly approached, she found further resolve to halt the project. Tall’s organizing efforts finally paid off. Pressure from tribal members ultimately convinced the tribal council to reject AMCOR’s proposal – although the council had initially disapproved of Tall’s objections. Later, a related company approached the neighboring Rosebud Reservation with the same offer. Tall helped the people of Rosebud halt that project as well. These victories have influenced other reservations across the country to fight against proposed waste dumps.
Tall has served on the board of directors of the Seventh Generation Fund. She has increasingly taken on the role of an elder, acting as an advisor and educator. She focuses on providing spiritual guidance to youth while continuing to inspire both native and non-native people around the world to protect the environment.