American Forest Alliance provides for Collective Progression (Collectiveprogression.org) the opportunity to be under their 501c3.
Besides doing great work to protect and restore forests and woodlands, they also are one of the biggest supporters of the movement to stop Mountain Top Removal.
As one of two co-directors of Collective Progression, I have been completely impressed with the dedication, flexibility, and support this organization has provided.
Review from Guidestar