This document discusses the emerging contractual partnerships between sustainability non-profit groups and corporations. While advocates argue the partnerships allow non-profits to leverage corporate influence and funding, there are also concerns about the increasingly business-like nature of these relationships and whether non-profits maintain their independence. The document explores examples like Forum for the Future, which offers different partnership levels and fees for corporations, and examines the risks if non-profits provide paid services without sufficient public benefits. Clear rules are important to legitimize corporate partnerships while maintaining non-profits' charitable missions.