Greenlandic rock flour: a unique material for Europe’s agricultural transition

Harnessing the prodigious power of the Greenlandic ice sheet, glacial rock flour (GRF) is a naturally occurring ultra-fine material with a median grain size <5μm, produced by subglacial abrasion of underlying bedrock. At least 3Gt of this mineralogically uniform resource lie around Greenland’s coasts, lending it massive potential as a scalable climate solution for European agriculture. Although unreactive in Arctic conditions due to temperature and seawater chemistry, GRF’s unique particle size enables it to achieve fast weathering kinetics once transported and deployed to more temperate croplands, all without the need for energy-intensive processing. High potassium (K), moderate phosphorus (P) content and positive effects on nitrogen soil retention also place GRF as a promising low-input alternative to conventional fertilizers, easing farmer acceptance by creating a co-revenue stream to subsidise carbon dioxide removal (CDR) revenues.  To unlock this potential however requires validation along the entire supply chain of GRF, from collection in Greenland to field application. This presentation summarizes nearly two years of data on GRF’s dual CDR and agronomic impacts in a Danish context. Firstly, we provide strong evidence of negligible in-situ weathering in Greenland, and explore how operational decisions, guided by robust life cycle analysis (LCA), can ensure that GRF is net-negative when applied on fields. Further downstream, we synthesize lab results and initial field trials that capture yield productivity gains and nitrogen loss reductions—while addressing the challenges of detecting statistically robust enhanced weathering signals in temperate settings. We finally highlight how insights from farmers and related service providers can be mobilized to best integrate application of GRF and similar ERW feedstocks in practical agricultural routines.