Sea foam may look sinister but it is mostly harmless and natural
Sea foam, often seen along Britain's coast, is a natural phenomenon caused by algae and weather conditions. It is formed when breaking waves churn up water containing organic material, creating foam that may appear sinister but is mostly harmless. While some may mistake it for pollution, the foam is a common occurrence and part of the marine ecosystem.
- ▪Sea foam is produced by a combination of algae and weather conditions.
- ▪The most common type of algae involved is phaeocystis, which is not toxic.
- ▪When algal blooms die, they leave behind organic material that creates foam when disturbed by waves.
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| Original publisher | World news | The Guardian |
| Canonical URL | https://www.theguardian.com/news/2026/may/22/sea-foam-may-look-sinister-mostly-harmless-natural |
| Publication time | Fri, 22 May 2026 05:00:50 GMT |
| Retrieval time | 2026-05-22T05:17:00.505Z |
| Last seen | 2026-05-22T05:32:45.532Z |
| Headline source | Publisher (no WeSearch rewrite) |
| Excerpt source | publisher body |
| Excerpt method | First ~120 words (~800 chars) of extracted publisher body, fair-use limited. |
| Summary | WeSearch · cerebras-chat (WeSearch summarizer) |
| Summary source text | contentText |
| Citation coverage | Summary is a WeSearch-generated derivative; primary citation is the original publisher URL. |
| Cluster | uMVB2z_OjCZV |
| Cluster logic | Grouped by semantic title/content similarity across sources within a rolling window. Same-publisher template collisions are excluded from coverage comparison. |
| Ranking reason | Story pages are not engagement-ranked. Hub feeds use recency, with optional source-diversified chronological ordering (cap consecutive stories per source). No personalized ranking. |
| Publisher visit | Yes — open original |
| Substitutes article? | No — link-out required for full text |
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| Indexing | May the item be indexed (stored, ranked, made findable)? | Allowed |
| Snippet | May a short excerpt of the publisher's text be shown? | Allowed |
| AI summary | May WeSearch generate its own short summary of the article? | Limited |
| Retrieval / RAG | May the content be exposed for third-party retrieval-augmented generation? | Not asserted |
| Model training | May the content be used to train AI models? | Not asserted |
| Commercial reuse | May the content be reused commercially? | Not permitted |
Basis: Derived from the published RSS/Atom feed. Contact: [email protected]. Reviewed: 2026-07-24.
Opening excerpt (first ~120 words) tap to expand
Breaking waves churn up water which contains a brown scum of organic material, creating the foam. Photograph: Charles McQuillan/Getty ImagesView image in fullscreenBreaking waves churn up water which contains a brown scum of organic material, creating the foam. Photograph: Charles McQuillan/Getty ImagesWeatherwatchEnvironmentSea foam may look sinister but it is mostly harmless and naturalPhenomenon, often seen around Britain’s coast at this time of year, is caused by a combination of algae and weatherDavid HamblingFri 22 May 2026 01.00 EDTSharePrefer the Guardian on GoogleAt this time of year a sinister-looking substance can often be sighted around Britain’s coast: a frothy foam piled up along the shoreline or appearing in long ribbons offshore.
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Excerpt limited to ~120 words for fair-use compliance. The full article is at World news | The Guardian.
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