Gregory Dipple studies mine tailings, Peter Van Straaten is an agro-geologist who studies the application of minerals as fertilizers. Thomas Vanacore owns rock quarries and studies the application of rock dust. Here they discuss the present state of scientific knowledge about the benefits and potential risks of the dual-purpose application of rock dust and mine tailings to farmland. Dipple believes that the most serious gap in knowledge concerns the possible addition of greenhouse gas because of the otherwise appropriate application of such soil amendments. They consider ways of encouraging the government to support progress faster because of the urgency of the climate threat. For the video, audio podcast, transcript, and comments: https://tosavetheworld.ca/episode-535-rocks-mine-tailings-climate.