Here’s the reality check the CDR industry needs to sit with: a new paper in Communications Earth & Environment (Nature portfolio) finds that scaling negative emissions technologies to the gigatons could create serious resource and environmental bottlenecks — some of which nobody is planning for.
The paper by Cobo, Galán-Martín, and Guillén-Gosálbez runs a comprehensive life-cycle assessment across the full CDR technology portfolio and identifies what the authors call “previously overlooked bottlenecks.”
The Key Findings
Biochar and BECCS could sharply raise nutrient demand, further compromising food security. That’s a non-trivial finding for the fastest-scaling CDR pathway. If we’re converting agricultural waste into carbon removal at scale, we need to account for what those nutrients were doing in the first place.
DAC and ocean liming could critically exacerbate the mining of key mineral resources. The irony: two of the technologies praised for their lower “collateral damage” on land use and biodiversity may create their own extraction pressures elsewhere.
The paper’s framing is important — it doesn’t argue against scaling CDR. It argues for informed scaling that balances multiple risks simultaneously.
The CDI Connection
This reinforces what CDI has been writing about: the need to shift from “Speed & Scale” to “Prove & Learn”. Rushing to gigatons without understanding resource constraints isn’t ambition — it’s recklessness.
For enhanced weathering specifically, the mineral supply question is real but manageable. The feedstock (basalt, limestone) is abundant, but processing, transport, and application at scale still require significant energy and infrastructure. CDI’s own research on ERW MRV has consistently highlighted that understanding what’s actually happening in the soil matters more than headline removal estimates.
Bottom Line
The CDR industry can’t afford to repeat the mistakes of other energy transitions — scaling fast and discovering resource conflicts later. This paper is a roadmap for doing it right: diverse technology portfolios, regional resource assessments, and honest accounting of trade-offs.
Read the paper. Then read it again.