Online, November 2021. Michael Goff presented at the Overview Roundtable on the environmental impacts of space exploration.

Lansing, MI, February 2020. Lee Nelson presented on the links between different dietary choices and their environmental consequences at an event called Sprouting, which was organized to spread environmental awareness and appreciation. It was held at The Fledge, a non-profit organization and space that helps local start-ups brainstorm and build their businesses.

Santa Fe, NM, July 2019. Michael Goff presented an overview of current and forecasted world energy production at the Santa Fe Institute, as part of their Sustainability Summer School program.

Nashville, TN, January 9, 11, and 23, 2018.  John van der Harst and Andrew Evans presented handouts on mode and system efficiencies and system length/population comparisons at a public hearing and subsequent committee and full meetings of the Metropolitan Council of Nashville and Davidson County on a light rail plan tax referendum.