What counts as a tree, and how do you count trees? What do you do when you're surprised by a grizzly bear? How do you get data from despots? Will AI replace humans, when it comes to analysing ecological data? Do ecologists hibernate in winter? Jingjing Liang from Purdue answers all these questions, and more.

Xavier Dupla discusses heavy metal contamination of soil and water, following enhanced weathering soil treatment. How much is too much? And what can we have to to clean up toxic residues? Citation: Dupla, X., Möller, B., Baveye, P.C. and Grand, S. (2023), Potential accumulation of toxic trace elements in soils during enhanced rock weathering. Eur J Soil Sci. Accepted Author Manuscript e13343. https://doi.org/10.1111/ejss.13343

Good morning, Reviewer 2 listeners. This is Pete Irvine from Challenging Climate. I've been a little disappointed by the Reviewer 2 crew starting a turf war with us, so I've decided to finish it. Today, Jesse and I have paid their studios a little visit - and it's safe to say I don't think we'll be having much trouble from Reviewer 2 in future. Right now, Jesse has @geoengineering1 down in the basement. - showing him the error of his ways. I'm sure he'll learn very quickly. Now, we don't want trouble with other podcasts - but if trouble comes, we I can assure you that we're ready for it. While you're waiting for the dentist to put Andrew's teeth back in, I hope you enjoy the Challenging Climate episode on Great Barrier Reef MCB.

Reviewer 2 reluctantly agrees to dish out another drubbing to "radical" economist Ron Baiman. @geoengineering1 discusses Ron's new paper on balancing short-term cooling - both local and global - with long-term CDR. Also, check out Ron's popular episode from last year on the Green New Deal. Links below: Paper "Our Two Climate Crises Challenge: Short-Run Emergency Direct Climate Cooling and Long-Run GHG Removal and Ecological Regeneration": https://journals.sagepub.com/doi/abs/10.1177/04866134221123626?journalCode=rrpa . (Healthy Planet Action Coalition (HPAC) preprint and presentation slides here: https://www.healthyplanetaction.org/presentations-guest-speaker-recordings .)

Other documents referenced include: Baiman et al. HPAC 2023 "The Case for Urgent Direct Climate Cooling": https://docs.google.com/document/d/1TowThwi6j6cX3iLGBRrj22D30cYhKa_9/edit, IEA 2022 "Solar PV Global Supply Chains": https://www.iea.org/reports/solar-pv-global-supply-chains/executive-summary , and MacDougal et. al. Biogeosciences 2020: “Is there warming in the pipeline? A multi-model analysis of the Zero Emissions Commitment from CO2”: https://doi.org/10.5194/bg-17-2987-202

Hot off the press, Sara Nawaz, Terre Satterfield and Devin Todd discuss their brand new paper on DAC acceptance with @geoengineering1. This episode was prerecorded, during the paper's editorial process. Paper: Exploring public acceptability of direct air carbon capture with storage: climate urgency, moral hazards and perceptions of the ‘whole versus the parts’ https://link.springer.com/article/10.1007/s10584-023-03483-7 - additional paper "Public evaluations of four approaches to ocean-based carbon dioxide removal"

https://doi.org/10.1080/14693062.2023.2179589

Can microwave regeneration eliminate the need for wasteful heating, in the DAC desorb step? @geoengineering1 interviews Fan Shi, McMahan Gray, and David Battaglia, from NETL. Paper: Energy-Efficient and Water-Saving Sorbent Regeneration at Near Room Temperature for Direct Air Capture. https://www.sciencedirect.com/science/article/abs/pii/S2589234723000076

Max Franks and Frank Venmans are interviewed by Robert Höglund on how to price temporary carbon storage. Matthias Kalkuhl, Max Franks, Friedemann Gruner, Kai Lessmann, Ottmar Edenhofer https://www.cesifo.org/node/73501

Frank Venmans and Ben Groom. Social value of offsets: https://www.frbsf.org/economic-research/wp-content/uploads/sites/4/groom-vsce-121621-paper.pdf

Frank et als paper on technological change that is mentioned: https://iaee2022.org/files/timetable/T000353_23_1.pdf

Jörg Schwinger presents work showing temperature overshoots can be recovered from, using CDR. @geoengineering1 finds lots to take issue with - model processes, intergenerational equity, and the risk of misinterpretation of superficially-reassuring studies. Paper: Emit now, mitigate later? Earth system reversibility under overshoots of different magnitudes and durations https://esd.copernicus.org/articles/13/1641/2022/

Marion Hourdequin explains her paper, which criticised Horton & Keith's justifications for SRM research. Considering various types of justice, she explains why tech-bro solutions often meet such fierce resistance. Climate Change, Climate Engineering, and the ‘Global Poor’: What Does Justice Require?

Marion Hourdequin

https://doi.org/10.1080/21550085.2018.1562525

Britta Clark schools @geoengineering1 on "How to argue about solar geoengineering". This will only encourage him, and generally make him even more insufferable in future. https://onlinelibrary.wiley.com/doi/abs/10.1111/japp.12643