Tethys is an online knowledge system that hosts information on the environmental effects of marine and wind energy (land-based and offshore). Tethys hosts regular webinars pertaining to topics of environmental concern, as a means to effectively disseminate new information and research efforts to a large international audience of stakeholders. Activities organized by OES-Environmental, WREN, and the US Department of Energy are recorded and made publicly available for those unable to attend the live event.