Heritage is often imagined as something we preserve for the future: we identify what matters, protect it from change, and hope it survives long enough for others to encounter it. That is the popular picture, at least.<\/p>\n\n\n\n
But Nature suggests another way of thinking about continuity \u2014 and it may deserve a place in that conversation.<\/p>\n\n\n\n
A soil, a sediment layer or a peat deposit can act as an environmental archive. It records traces of what has happened, yet it never stays untouched.<\/em><\/p>\n\n\n\n Material is deposited, transformed, mixed, eroded and redistributed; radioactive substances decay; new ones are formed.<\/p>\n\n\n\n The archive changes continuously \u2014 and still it keeps information about the past.<\/em><\/p>\n\n\n\n This made me wonder: could it be a useful way of thinking about heritage?<\/p>\n\n\n\n My recent work concerns a rather obscure radioactive isotope, lead-210 (210<\/sup>Pb), which environmental scientists use to study atmospheric fallout and to date relatively recent sediments, soils and peat.<\/p>\n\n\n\n The interesting point for me was not the isotope itself but the idea of the environment as an archive.<\/p>\n\n\n\n The 210<\/sup>Pb record is not a document filed away intact. It is produced by natural processes that never stop: material arrives, radionuclides transform, sediments shift, and the record that results has to be read and interpreted.<\/em><\/p>\n\n\n\n A sediment layer need not stay identical to its original state to tell us something about its history. In other words, the archive stays useful not despite change but through it.<\/p>\n\n\n\n The real question may be less whether something stays exactly as it was, and more whether, as it changes, it still holds on to a pointer to what came before.<\/em><\/p>\n\n\n\n This is not a new thought in heritage studies.<\/p>\n\n\n\n Cornelius Holtorf has argued for years that heritage strengthens cultural resilience precisely by helping us accept loss and transformation rather than resist them, and more recently that conservation itself can be understood as regeneration \u2014 ever changing, never less than whole. What the environmental sciences add is a very concrete example of the same idea.<\/p>\n\n\n\n Schematic: excess \u00b2\u00b9\u2070Pb decays with depth while the \u00b9\u00b3\u2077Cs peak fixes 1963 \u2014 a record that keeps time while never ceasing to change.\u00a0 (Illustration by the author)<\/em><\/p>\n\n\n\n <\/p>\n\n\n\n The uranium-mining landscapes that prompted my study make this more interesting still.<\/p>\n\n\n\n Mining leaves behind long-lived material: tailings, waste rock, stockpiles, open workings and other residues. These keep interacting with air, water, soil, plants and sediments long after the mining itself has stopped. Uranium mines also release radon gas, which travels in the air and, in turn, generates 210<\/sup>Pb.<\/p>\n\n\n\n This raised a specific worry. Most of the 210<\/sup>Pb in soils and sediments comes from radon gas emanating naturally out of the ground; the steady amount that settles each year is what lets scientists read the record, rather as one reads tree rings. Could that extra radon from uranium mines add enough 210<\/sup>Pb to distort the record?<\/p>\n\n\n\n For documented mine sizes, the answer is largely reassuring: the added radon is far too little to shift regional 210<\/sup>Pb levels in any measurable way. Close to a site the picture can differ, and there it is dust and eroded material that could disturb the record.<\/p>\n\n\n\n What I find more intriguing is what the question reveals.<\/p>\n\n\n\n Human activity does not only leave heritage objects behind. It also leaves materials that enter the ongoing processes of nature.<\/em><\/p>\n\n\n\n The landscape itself can become part of the recording mechanism.<\/em><\/p>\n\n\n\n What this really describes is archaeology \u2014 an archaeology that faces the other way. The archaeologist reads a record already deposited; here the record is still being laid down, as heritage or as mining residue, and the question is how some later present will read it.<\/p>\n\n\n\n This brings me close to an idea that seems important for heritage:<\/p>\n\n\n\n that keeping memory is about more than keeping things unchanged.<\/em><\/p>\n\n\n\n Something can change a great deal and still work as a memory, so long as it keeps some capacity to point beyond itself \u2014 to an event, a place, an action, a history.<\/p>\n\n\n\n The pointer may itself change. What matters is that the relationship holds.<\/em><\/p>\n\n\n\n Nature offers no end of examples. A landscape can be transformed and still carry traces of earlier uses. Sediments can be disturbed and still preserve a chronology. Material can move, decay and recombine while some trace stays legible.<\/p>\n\n\n\n The archive, in this sense, is not a container. It is a process.<\/em><\/p>\n\n\n\n The heritage sector will recognise all this; it has been working in this direction for some time. What Nature offers is a reminder of how ordinary the principle really is. It invites a small shift of emphasis \u2014 from asking only:<\/p>\n\n\n\n How do we preserve this for future generations?<\/em><\/strong><\/p>\n\n\n\n to also asking:<\/p>\n\n\n\n How might this change through time and still point back \u2014 remaining a past that some future can still read?<\/em><\/strong><\/p>\n\n\n\n That is a different kind of responsibility. It does not mean giving up on preservation, nor assuming that every trace will survive.<\/p>\n\n\n\n It means only that continuity and sameness are not the same thing.<\/em><\/p>\n\n\n\n Nature does not keep its records by stopping time. It keeps them while time is passing \u2014 and culture, in its own way, does much the same.<\/p>\n\n\n\n That is less a lesson Nature teaches heritage than a resemblance worth sitting with: good company, perhaps, for a field already moving this way.<\/p>\n\n\n\n Pescatore, C. (2026) An upper bound on uranium-mining radon contributions to regional environmental 210<\/sup>Pb inventories<\/em>. Journal of Environmental Radioactivity 299, 108143. https:\/\/doi.org\/10.1016\/j.jenvrad.2026.108143<\/a><\/p>\n\n\n\n Pescatore, C. (2026) When Nuclear Waste Becomes Archaeology<\/em>. UNESCO Chair on Heritage Futures blog, Linnaeus University, 25 August 2026. https:\/\/blogg.lnu.se\/unesco\/?p=4834<\/a><\/p>\n\n\n\n Holtorf, C. (2018) Embracing change: how cultural resilience is increased through cultural heritage.<\/em> World Archaeology 50(4), 639\u2013650. https:\/\/doi.org\/10.1080\/00438243.2018.1510340<\/a><\/p>\n\n\n\n Holtorf, C. (2026) Beyond the 1964 Venice Charter: cultural heritage as regeneration (ever changing never less than whole)<\/em>. Conservar Patrim\u00f3nio. https:\/\/conservarpatrimonio.pt\/article\/view\/37063<\/a><\/p>\n\n\n\nNature does not preserve by standing still<\/h3>\n\n\n\n
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<\/figure>\n\n\n\nWhat about human traces?<\/h3>\n\n\n\n
Memory without stasis<\/h3>\n\n\n\n
Learning from Nature<\/h3>\n\n\n\n
Further reading<\/h3>\n\n\n\n
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