Summer temperatures pose major challenges for museums. Photo: Bibhash (Polygon.Cafe) Banerjee on Unsplash

Summer temperatures pose major challenges for museums.
Photo: Bibhash (Polygon.Cafe) Banerjee on Unsplash

Not only are we groaning under the heatwave, but also museums and the works of art entrusted to them. Due to climate change, we are having to deal with extreme heat more and more frequently, and museums are looking for ways and strategies to prepare themselves. What measures are they taking? How can exhibition venues become climate-resilient and sustainable?

Climate change also poses fundamental challenges for cultural institutions worldwide. More and more museums are therefore developing strategies to make their operations, collections and exhibitions sustainable. This is not just about reducing CO₂ emissions, but also about institutional resilience, social responsibility and setting an international example. The term “sustainability in museums” encompasses far more than just technical measures – it requires a rethink of the entire cultural sector.

According to a study by the International Council of Museums (ICOM, 2024), air conditioning accounts for up to 70 percent of energy consumption in many museums. The Royal Academy of Arts in London has therefore installed a new system with adaptive airflow that saves CO₂ without compromising conservation standards. As the “Museum Sustainability Alliance” emphasizes, museums as social actors must also lead the way in ecological action – and sensitize visitors and partners to sustainable behavior. Sustainability in museums means combining environmental awareness with cultural responsibility.

A key area of activity is exhibition construction in particular. More and more museums are relying on modular wall systems, regional materials and multiple use. The Weltmuseum Wien, for example, uses recyclable plinths and works with loans from neighbouring countries to minimize transport routes. Digital exhibitions and augmented reality are also considered CO₂-saving alternatives. As the German Museums Association Journal 2025 writes, “in future, sustainability must be just as much a part of curatorial planning as storytelling”. Sustainability in museums will thus become an integral part of every exhibition.

Periods of heat, flooding and air pollution are increasingly endangering depots and collections. Museums are responding to this with adapted climate corridors, low-pollutant packaging and sensor-controlled early warning systems. Organic materials such as textiles, leather and wood are particularly at risk. For this reason, the Rijksmuseum Amsterdam has installed a monitoring system that detects microscopic climate changes and controls automatic ventilation impulses. Sustainability in museums here also means preventive conservation under changing environmental conditions.

Sustainability in museums is not only technical, but also social. This includes fair working conditions, diversity, barrier-free offers and inclusive educational programs. Many museums – such as the Humboldt Forum in Berlin – are now integrating sustainability into their mission statement. The involvement of local communities, transparent communication processes and participatory projects are all part of a holistic sustainability concept. Sustainability in museums thus not only promotes environmental protection, but also strengthens social interaction.

The path to genuine sustainability is complex for museums – but unavoidable. It opens up new scope for action for conservators, exhibition makers and collection managers, but also requires interdisciplinary cooperation and continuous training. If you want to do sustainable cultural work, you have to consider ecological, economic and social aspects together. Museum practice is facing a change that is more profound than any modernization of recent decades. Sustainability in museums is thus becoming the key to climate-resilient and future-proof exhibition venues.

Read more:What measures is the Folkwang Museum in Essen taking to become a green museum?

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Alongside other important works by Rembrandt (1606-1669), the Berlin Gemäldegalerie owns his masterpiece “Susanna and the Two Old Men” (1647). Recent studies of the painting have produced spectacular new findings. We spoke about the discoveries with Katja Kleinert, research assistant, and Claudia Laurenze-Landsberg, conservator at the Gemäldegalerie der Staatlichen Museen zu Berlin (SMB). The latest results of their […]

Alongside other important works by Rembrandt (1606-1669), the Berlin Gemäldegalerie owns his masterpiece “Susanna and the Two Old Men” (1647). Recent studies of the painting have produced spectacular new findings. We spoke about the discoveries with Katja Kleinert, research assistant, and Claudia Laurenze-Landsberg, conservator at the Gemäldegalerie der Staatlichen Museen zu Berlin (SMB).

From March 3 to May 31, 2015, the Berlin Gemäldegalerie and the Kupferstichkabinett (SMB) are presenting the latest results of their examination of the Dutch artist Rembrandt Harmensz. van Rijn in the exhibition “Rembrandt’s Berlin Susanna and the Two Old Men. The creation of a masterpiece”. What exactly did you find out?

Kleinert: Rembrandt worked on the Berlin “Susanna” for more than a decade and created three different versions of the depiction during this time. This was already known and documented by the Rembrandt Research Project. Now, however, it is possible to reconstruct the three versions in detail. In addition, in collaboration with the Kupferstichkabinett, it has now been possible to reassess the time when work on the painting began. The first composition must have been created around 1635 rather than 1638. What was previously completely unknown and truly spectacular is the discovery that the work was extensively reworked again in the 18th century.

How did you track down this sensation?

Kleinert : The decisive clue came from a reproduction engraving by Richard Earlom (1743-1822) from 1769. The original is kept in the Kupferstichkabinett (SMB). The sheet documents the version of the picture that Rembrandt left to posterity in the 17th century. A comparison with the present-day work reveals how much more differentiated the painterly execution of the painting must originally have been. As a result, it was possible to correlate existing art technological results, which proved that parts of the painting had clearly been reworked at a later date.

Laurenze-Landsberg: ” Earlom’s reproduction engraving was a relief for me. I had already examined the panel painting with a stereomicroscope before I became aware of it. The separation of the paint layers and chipped areas revealed beautiful, precisely executed details that had been very roughly painted over. At the time, however, I still assumed that Rembrandt had reworked the painting and was confused by the master’s superficial, less meticulous way of working.

What investigations did you then carry out to investigate the suspicion of a later intervention by a third party?

Laurenze-Landsberg: In addition to the neutron autoradiographs, we also analyzed the X-ray, infrared and grazing light images and examined the image stereoscopically. The image carrier is a sugar box wood which, contrary to previous assumptions, is not made of mahogany but amaranth. The sugar trade flourished in Amsterdam in the 17th century.

You assume that the later overpaintings are by the English painter Sir Joshua Reynolds (1723-1792). What supports this theory?

Kleinert : The provenance of Rembrandt’s Berlin “Susanna” is very well documented. Two painters had the panel in their possession. Sir Joshua Reynolds was one of them. He owned the painting for a particularly long time. We also know that Reynolds was interested in old painting techniques. And that he often worked on other people’s works and altered or corrected them to suit his own taste. He was also not afraid to remove paint in order to study the working methods and techniques of other artists. By looking at the original together with English colleagues from the Reynolds Research Project, the painting technique could then be clearly attributed to Reynolds.

Laurenze-Landsberg: The neutron autoradiography supports this thesis. It shows intense blackening caused by the antimony isotope SB-124. Since no tin can be detected at the same time, the antimony-containing pigment must be Naples yellow. It came into increasing use from the middle of the 18th century. Elsewhere, the paint layer is swollen, which indicates the use of copaiva balsam. This is a resin that was used to “freshen up” paintings. It is known that Reynolds used it as a binding agent.

How do you assess the reworkings today?

Kleinert: There are examples of even more far-reaching interventions that raise the question of the extent to which one can still speak of an original masterpiece. The Berlin “Susanna and the Two Old Men” is a painting that has been altered at a later date and must be declared accordingly. But it remains a Rembrandt.

The interview was conducted by Britta Grigull.

More on Rembrandt’s drawings, the biblical Susanna theme and the corresponding Berlin exhibition in RESTAURO 2/2015.

Architects in snow fever

Building design

At the beginning of February 2015, the tenth open German Architects’ Championships in the disciplines of skiing and snowboarding took place in Mellau and Damüls, Austria. Around 120 participants took up the challenge. around 120 participants took up the sporting challenge.

At the beginning of February 2015, the tenth open German Architects’ Championships in the disciplines of skiing and snowboarding took place in Mellau and Damüls, Austria. Around 120 participants took up the challenge. around 120 participants took up the sporting challenge. At the warm-up in Peter Zumthor’s “Werkraum” in Andelsbuch on Thursday evening, the early arrivals were able to get a first impression. In the exhibition “No Name Design” by Franco Clivio, the focus was on the inconspicuous things that accompany us in everyday life and yet rarely attract attention.

The following evening, the GAM open 2015 was officially opened by patron Lutz Heese (President of the Bavarian Chamber of Architects) in the Elsenalpstube in Damüls. After the subsequent ‘Kässspätzle’ meal, which was a culinary highlight, originally served in a wooden bowl, the 4 kilometer long and illuminated toboggan run into the valley could be tested. In bright sunshine and perfect conditions with 1.90 meters of snow, the starting signal for the 10th GAM open in the parallel slalom discipline for skiers and snowboarders was given on Saturday morning.

Jannis Merz (men’s skiing) with 22.420s, Armin Tittel (men’s snowboarding) with 27.360s, Birgit Keppler (women’s skiing) with 26.430s and Ulrike Schneider (women’s snowboarding) with 34.780s won the championships with best times. The office championship went to the team from the Reutlingen Chamber of Architects (Nightmare 2). The award ceremony took place in the evening, followed by a party at the four-star Design Hotel Sonne in Mellau.