Final answer:
Mirrors were used by Dakota Access Pipeline protestors to symbolize reflection, environmental awareness, and cultural symbolism, not as a symbol of renewable energy.
Step-by-step explanation:
The use of mirrors as a form of protest to the Dakota Access Pipeline is not related to renewable energy. Mirrors were used symbolically by protestors to encourage self-reflection among the police and pipeline workers on the potential impacts of their actions on the environment, the Indigenous communities, and future generations. They served as a symbol of reflection, highlighting the need for environmental awareness and represented a form of cultural symbolism not just for Native Americans but for all people who support the sustainable treatment of the land.