Andrew and Walker discussed a wide variety of things - here are some useful links:
\nAluminum increases net carbon fixation by marine diatoms and decreases their decomposition: Evidence for the iron\u2013aluminum hypothesis - https://aslopubs.onlinelibrary.wiley.com/doi/10.1002/lno.11784
\nSolar geoengineering can alleviate climate change pressures on crop yields - https://www.nature.com/articles/s43016-021-00278-w
\nMission Zero Technologies: https://missionzero.tech
\nHeirloom: https://www.heirloomcarbon.com
\nThe Future Forest Company: https://thefutureforestcompany.com
\nCarbonBuilt: https://www.carbonbuilt.com
\nRunning Tide: https://www.runningtide.com