The CDR Policy Scoop SHOWDOWN: Biochar vs Direct Air Capture - with Martin Freimüller
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Apr 7, 2025 In a lively debate, Martin Freimüller, Co-Founder and CEO of Octavia Carbon, champions Direct Air Capture (DAC) as a vital technology for carbon removal. He argues for its scalability and global potential, especially from Kenya. In response, biochar expert Sebastian Manhart highlights biochar's impressive durability and agricultural advantages. The discussion uncovers the challenges of scaling each solution, revealing audience preferences while emphasizing that both methods are essential for significant climate action. Tune in for an engaging clash of ideas!
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DAC's Strong Cost-Decline Argument
- Martin Freimüller argues DAC has a steeply negative cost curve while biochar is constrained by biomass and limited cost declines.
- He claims DAC's recent unit cost halving demonstrates rapid engineering-driven cost reductions unlike biochar's feedstock limits.
Shift Portfolio Toward Scalable DAC
- Martin urges carbon removal buyers to allocate more of their portfolio to DAC this decade to avoid backing solutions that may become expensive or limited.
- He recommends prioritizing technologies with potential to scale to gigaton levels rather than only cheap today options.
Biochar's Current Delivery Lead
- Sebastian states biochar delivered the majority of durable CDR historically and is already cost-effective at $150–$200/t.
- He contrasts biochar's current delivery with DAC’s tiny historical share and far higher costs.