Forums are intended to stimulate knowledge sharing and debate by focusing sharply on specific opportunities and challenges. The goal is to facilitate dialog across diverse fields of human endeavor on the challenges of achieving transitions to sustainability and mitigating environmental problems, and to generate the knowledge most needed to inform and promote those approaches. Forums are often launched with invited framing article(s) that pose key questions designed to prompt open submissions over six months or a longer period of time. Invited videos, audio, and other visual contributions may be part of a Forum.