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We re-checked that finding using completely different data and a different program, and it holds up.\n\nWhat was tested \342\200\224 One specific finding from the 2018 paper: that between 1982 and 2016 the world\'s oceans gained roughly 30 more marine-heatwave days a year. We did not test the paper\'s better-known headline \342\200\224 a 54% rise measured back over a whole century \342\200\224 because that one cannot be checked independently; we explain why in \342\200\234What we did not test\342\200\235.\n\nWhat was found \342\200\224 It is confirmed. Using satellite sea-surface temperatures from the European Space Agency\'s climate record (not the American data the original used) and a separate, independent piece of software to spot the heatwaves, we measured almost the same rise \342\200\224 about 32 extra marine-heatwave days over the period, against the 30 the original reported, a difference of about 6%. The frequency and the length of heatwaves also went up, matching the original.\n\nDoes natural variability explain it? \342\200\224 No. When we removed the effect of El Ni\303\261o and La Ni\303\261a \342\200\224 the natural warm/cool swings in the Pacific \342\200\224 the rise was only slightly smaller and was still there. So the trend is not just a side-effect of those cycles.\n\nWhy this carries weight \342\200\224 The two studies share neither the data nor the software, so their agreement is evidence about the finding itself, not a mistake copied from one to the other. A shared dataset or shared code could hide the same error in both; here nothing was shared.\n\nWhat we did not test \342\200\224 The paper\'s famous \342\200\23454% over the past century\342\200\235 figure needs daily temperature records from before 1981, and no independent global record that far back exists \342\200\224 for anyone. So we tested only the satellite era (about a third of the paper\'s span) and say so plainly, rather than claiming more than the data allows.\n\nDifferent data, different software, same answer: marine-heatwave days really are rising." } } } rows { name { value: "about" } } rows { prefix { value: "https://w3id.org/sciencelive/np/" } } rows { name { value: "RAGjvtR-Pq6576AIEsj5CTiLW3yK0cPEbfgk7OjhxyVVM" } } rows { quad { p_iri { prefix_id: 7 } o_iri { prefix_id: 12 } } } rows { name { value: "audience" } } rows { prefix { value: "http://www.wikidata.org/entity/" } } rows { name { value: "Q2388316" } } rows { quad { p_iri { prefix_id: 7 } o_iri { prefix_id: 13 } } } rows { name { value: "generatedAtTime" } } rows { datatype { value: "http://www.w3.org/2001/XMLSchema#dateTime" } } rows { quad { s_iri { prefix_id: 8 name_id: 4 } p_iri { prefix_id: 5 name_id: 21 } o_literal { lex: "2026-08-15T17:12:52.228076+00:00" datatype: 1 } g_iri { prefix_id: 8 name_id: 7 } } } rows { name { value: "wasAttributedTo" } } rows { prefix { value: "https://w3id.org/np/RAIA9ECaN2ypOVvl4YeNjT6nbpwko9xMcctxB_uYscLG4/" } } rows { name { value: "claude-ai-agent" } } rows { quad { p_iri { prefix_id: 5 name_id: 22 } o_iri { prefix_id: 14 } } } rows { quad { s_iri { prefix_id: 9 name_id: 2 } p_iri { prefix_id: 5 name_id: 21 } o_literal { lex: "2026-08-15T17:12:52.228076+00:00" datatype: 1 } g_iri { prefix_id: 8 name_id: 9 } } } rows { quad { p_iri { prefix_id: 5 name_id: 22 } o_iri { prefix_id: 14 } } } rows { name { value: "sig" } } rows { name { value: "hasAlgorithm" } } rows { quad { s_iri { prefix_id: 8 } p_iri { prefix_id: 3 } o_literal { lex: "RSA" } } } rows { name { value: "hasPublicKey" } } rows { quad { p_iri { } o_literal { lex: "MIIBIjANBgkqhkiG9w0BAQEFAAOCAQ8AMIIBCgKCAQEAyuQ7Hi/zQ7hDZtMtLWK1JKU83Kgo8NqC+b8sxD5IoiekPctXVA8iM0zD/9pcp1txGXjX/fUj5HRUkOn4RVHP3fFa/3irQYpZFQ5fHRj8MQ7kJ6AEd1oggfajDevZGz63hj6Vigo+BNYBXqhcbWVAfLfbzQPAegce9zH6n9vTqKYMrwrSxPQdhoAcoaKOqY8gRiJgzekeEr+iEqa63X1HwWtYDs7X25a9xWbgaDSsRjzZGVUVOn1vYdSfWAaIw+EB9CiJfKm1zuXcur5PDziMW1pnZG6/NQtrA7AM3gLnoSoU3glkm5UhksGNqu2SV+j8oZLg7v6C5/sg2f6LIJMeFwIDAQAB" } } } rows { name { value: "hasSignature" } } rows { quad { p_iri { } o_literal { lex: "jpCVyUGS329sZ2zVuR8NzptfGJj9yExx52ZJNrn8yR91mNEbKU2YvYWqtBxIOXAE/fCozdI3g1sJhU6mtO6cQ2Od8VJmY4cCHHOu+2xIVyintr9dws1JpfZznZpWc5ijJZVzpFYSAkKxtxQ9iGWmKCU5wQNzIS7f37Za3VkxmVP/vZKRWgClibB4F0sXFeh+56pjSQzb+/6vFZd+HvxdKVRn9dSc+c81KvMYd3j5l1q93neLSJlvuQWNWxYqeewKjyIxfX4YOC+XN3LS4Uio4fxoR+P4mA7KH8/E608S63EDWHhbc4csyA/I7WSb7bLWOWz/Ai+sGOftp3JUZmY81A==" } } } rows { name { value: "hasSignatureTarget" } } rows { quad { p_iri { } o_iri { prefix_id: 9 name_id: 2 } } } rows { name { value: "signedBy" } } rows { quad { p_iri { prefix_id: 3 name_id: 29 } o_iri { prefix_id: 14 name_id: 23 } } }