{
  "id": 17935363,
  "title": "Concrete waste as a source of calcium and alkalinity for coccolithophore cultivation: an experimental test of carbon dioxide removal and sequestration",
  "url": "https://urgent.news/2026/11/03/concrete-waste-as-a-source-of-calcium-and-alkalinity-for",
  "topic": "science",
  "section": "Science",
  "published": "2026-11-03T00:00:00.000Z",
  "source": {
    "name": "bioRxiv",
    "slug": "biorxiv",
    "url": "https://www.biorxiv.org/content/10.64898/2026.10.31.763296v1?rss=1"
  },
  "original_language": "en",
  "account": null,
  "summary": "Cultivation of calcifying microalgae has been proposed as a route to carbon dioxide removal (CDR), but biogenic calcification releases CO2 unless the calcium supplied also adds alkalinity. We used cultures of the coccolithophore Chrysotila sp to test whether hydrated lime (Ca(OH)2), supplied as a reagent or within ground waste concrete, can provide both calcium and alkalinity. In a 26-day…",
  "key_points": [],
  "editors_take": null,
  "illustration": null,
  "coverage": {
    "outlets": 1,
    "also_reported_by": []
  },
  "ai_generated": true,
  "disclaimer": "Summaries, key points and the editor’s take are written by software from other outlets’ reporting and may contain errors — always check the linked original."
}