Tag: CO2-Ausstoss

  • Zurich focusses on the future

    Zurich focusses on the future

    The canton of Zurich looks to the north, or more precisely to Copenhagen, as a pioneering example. The Danish capital has impressively demonstrated that ambitious climate targets can be achieved without compromising on the quality of life. With an 80 per cent reduction in CO2 emissions since 2012, Copenhagen has achieved a remarkable feat. Inspired by this, the canton of Zurich is striving to achieve greenhouse gas neutrality by 2040, or by 2050 at the latest. This target, which will be put to a vote by Zurich’s electorate on 28 September 2025, is a clear commitment to a sustainable climate policy. It is not just a question of defining a target, but of consistently driving forward the effective reduction of CO2 emissions. This is an endeavour that requires determination and innovative strength.

    Success through targeted measures
    Alongside climate protection, the canton of Zurich is investing heavily in the preservation and promotion of biodiversity. Habitats for flora and fauna are being reclaimed through ecological upgrading, renaturalisation and near-natural maintenance. Successful monitoring impressively demonstrates how quickly nature adapts and thrives. One outstanding example is the upgrading of streams as part of the “Diverse Zurich Waters” programme, which led to the rapid reintroduction of dragonflies. The adapted maintenance of embankments along cantonal roads is also having an effect. Life is pulsating there, insects and small animals are once again finding a suitable habitat. These successes prove that the commitment to biodiversity is worthwhile and that nature responds quickly with targeted measures.

    Setting the course for a sustainable future
    The canton of Zurich is setting the course for a sustainable future by revising various laws and introducing new instruments.

    Noise protection ordinance
    The consultation on the revision of the Noise Abatement Ordinance, which is due to come into force on 1 April 2026, runs until 6 October 2025. This is a direct consequence of the amendments to the Environmental Protection Act adopted in September 2024.

    “Core zone plansGIS map
    A new digital map now provides a comprehensive overview of the legally binding supplementary plans for “core zones” and their elements, based on the PLR-cadastre.

    CO2 Ordinance
    The Federal Council has brought the revised CO2 Ordinance into force with partial retroactive effect from 1 January 2025. It sets reduction targets for greenhouse gas emissions by 2030 and specifies measures for adapting to climate change as well as subsidies for climate-friendly technologies.

    Combating invasive organisms
    The consultation on a revision of the Environmental Protection Act, which is intended to give the cantons more powers in the fight against invasive alien organisms, is open until 13 October 2025.

    Parking regulations
    An amendment to the Planning and Building Act from 1 August 2025 will make it possible to reduce the number of parking spaces in individual cases, provided that there is no relocation to public spaces.

    ÖKOPROFIT
    This tried-and-tested programme successfully helps companies to get started with environmental management in order to reduce costs, optimise resource efficiency and improve their environmental footprint. The canton of Zurich is endeavouring to get other cantons interested in ÖKOPROFIT.

    Listed buildings
    A bill currently undergoing consultation aims to simplify the construction and energy modernisation of listed buildings.

    Deep geological repository
    The general licence applications for the deep geological repository and the fuel element packaging facility, submitted by Nagra, are now publicly accessible after being reviewed and amended.

    Expansion of large-scale hydropower
    A report published by the Federal Council on 13 June 2025 highlights the considerable potential, but also the uncertainties surrounding the renewal and expansion of large-scale hydropower.

    Zurich is ready to take on the challenges of climate change and utilise the opportunities for a more sustainable future. It’s time to act, or as they say in Denmark “Så kom nu i gang!”

  • City Council approves CHF 300 million for CoolCity

    City Council approves CHF 300 million for CoolCity

    On 10 July 2024, the Zurich City Council approved expenditure of CHF 303.7 million from the “Thermal grids” framework credit for the realisation of the CoolCity energy network. This will heat and cool Zurich’s city centre with renewable energy from Lake Zurich and thus represents a significant step towards reducing the city’s CO2 emissions to net zero by 2040.

    Expansion of thermal grids
    The expansion of thermal grids is one of the greatest levers that the city of Zurich has to reduce CO2 emissions. Fossil-fuelled heating systems can be replaced by connecting to district heating and the local gas distribution network can be replaced in stages. The CoolCity energy network, which runs on 100 per cent renewable energy, should make a major contribution to this.

    Network area and utilisation of lake water
    The network area extends from the main railway station to Bürkliplatz, bordered by the Limmat, Sihl and Schanzengraben rivers. It includes the City, Fraumünster Energy Network and Old Town perimeters. In future, the properties there are to be heated and cooled with Zurich lake water, which will enable the greenhouse gas emissions of the connected properties to be reduced to net zero.

    Lake water and energy centres at the heart of the network
    The construction of a lake water and energy centre is necessary to realise the network. Lake water will be collected at a depth of 28 metres at the Zürichhorn and transported to the lake water centre in the Kurt Guggenheim complex via a two-kilometre-long pipeline. There, energy is extracted from the lake water using heat exchangers, which is then channelled to the ewz Selnau substation. The cooled lake water is then returned to the Limmat.

    The heart of the energy network will be the energy centre in the former ewz Selnau substation. Here, the heat and cold obtained from the lake water will be brought to the required temperature using heat pumps and chillers. Following extensive investigations, the ewz Selnau substation has proven to be the ideal location to fulfil the technical and economic requirements.

    Staged construction between 2025 and 2039
    The energy network will be realised in stages between 2025 and 2039 and will be implemented in coordination with the civil engineering department’s road and utility projects. The first energy supply is planned for 2031, whereby the continuous expansion will have largely covered the supply area (excluding the perimeter of the old town) by 2035. The connection of the old town is planned for 2035 to 2039.

    The city council already approved CHF 8.5 million for preliminary investments from the framework credit in 2023. Ewz has started the initial construction work and is building a connecting structure between the CoolCity and Fraumünster energy networks, which will be completed in spring 2025.

    An important step towards climate neutrality
    The CoolCity energy network is a key building block on the path to climate neutrality in the city of Zurich. By using 100 per cent renewable energy from Lake Zurich, the city centre is supplied with sustainable and environmentally friendly heating and cooling, making a significant contribution to reducing greenhouse gas emissions.

  • Timber as a key building material for the development of urban areas

    Timber as a key building material for the development of urban areas

    Efficient use of energy and climate protection in buildings
    In view of the high energy consumption of buildings and their contribution to CO2 emissions, it is crucial to reduce energy requirements both during the construction phase and during the use of buildings. Thanks to its CO2-storing nature and efficient production methods, timber construction makes a significant contribution to reducing so-called grey energy.

    Modernisation and renovation of the building structure
    Many buildings in Germany are over 25 years old and need to be modernised and renovated in terms of energy efficiency. Timber construction offers innovative solutions here, such as adding storeys for efficient space utilisation and redensification, combined with an improved energy balance. Increasing urbanisation and rural exodus require intelligent building concepts in cities.

    Urbanisation and the role of timber construction
    Timber construction is proving to be the ideal solution for vertical and horizontal redensification. Thanks to its low weight and high degree of prefabrication, timber construction is particularly suitable for use in densely built-up metropolises.

    Timber construction is more than just a traditional construction method – it is an answer to the pressing questions of our time regarding climate protection and sustainability. Similar to concrete and steel at the beginning of the 20th century, timber construction has the potential to solve future construction tasks efficiently and sustainably and thus contribute to a more sustainable design of our urban landscapes.

  • Berner Kantonalbank cooperates with Neustark

    Berner Kantonalbank cooperates with Neustark

    Berner Kantonalbank(BEKB) is promoting CO2 storage facilities in the Bern-Solothurn region. To this end, it has agreed a cooperation with the Bernese start-up Neustark, according to a press release. The aim is to support its innovative technology for the permanent storage of CO2 in demolition concrete. The aim is to remove around 1,000 tonnes of CO2 from the atmosphere in the BEKB economic area over the next ten years.

    Neustark, a spin-off from the Swiss Federal Institute of Technology in Zurich founded in 2019, is the first company in the world to put carbon removal through mineralisation in demolition concrete into commercial practice and set up a network of storage facilities, according to the press release. In the summer of 2023, the largest plant to date in the BEKB economic area was put into operation in Biberist, Solothurn. Further facilities in the region are being planned. “Through our cooperation, we are not only promoting innovative technologies to achieve climate targets, we are also contributing to the circular economy in the region and making it possible to permanently remove CO2 emissions in our own economic area,” BEKB CEO Armin Brun is quoted as saying.

    In 2022, BEKB’s operational CO2 emissions amounted to 1153 tonnes. These are to be further reduced through various measures. Through this cooperation with Neustark, the bank will permanently remove 100 tonnes of CO2 from its operational emissions in its own economic area every year from 2024. According to the information provided, these are the estimated residual emissions that are unavoidable for BEKB and cannot be reduced in the future.

  • “co-operate” – a model for climate-friendly construction

    “co-operate” – a model for climate-friendly construction

    As far as the sparing use of resources and the reduction of CO2 emissions are concerned, the campus that is taking shape on the Empa site in Dübendorf should certainly become a model student – from the top to the bottom, from the roofs to a depth of 100 metres, where the earth probes of a unique experimental seasonal energy storage system end. In summer, these “tubes” will store the waste heat from, for example, the refrigeration machines, ventilation systems and laboratory equipment, and then use it in winter for heating or for the production of hot water. The goal: to reduce the CO2 emissions of the buildings on the entire campus to a minimum and at the same time explore this innovative technology for a sustainable energy future.

    Minimising greenhouse gas emissions: This aspiration also shapes the constructions of the new campus. The three-storey building to the right of the entrance is a unique “wood-concrete car park” whose ceilings are a sophisticated construction of spruce beams and slabs with concrete overlay. According to the construction company Implenia, this hybrid construction method made it possible to reduce the thickness of the concrete layers to about one third. A significant saving was made on the “climate polluter” cement: around 9,300 m2 of concrete ribbed ceilings were replaced with wooden beam ceilings – also a contribution to the current trend of replacing concrete, where possible and sensible, largely with constructions made of wood.

    According to Kevin Olas, Head of Real Estate at Empa, one of the challenging aspects of this project was the cleverly integrated installation of lighting, electrical lines and waste water pipes, so as not to detract from the aesthetics of this sophisticated hybrid construction. In addition, the planning also had to take future aspects into account: With a view to climate change, the multi-storey car park was planned as a modular construction made of demountable prefabricated parts – with a view to a more distant future in which individual mobility may play a lesser role than it does today. Then parts of the building could also be converted into workshops or for other purposes.

    Urine as raw material for fertiliser
    In this future, environmentally friendly recycling will also determine building: Not only steel, concrete or wooden elements can be recycled in a climate-friendly way, but also human “raw materials”. Take urine, for example: in the large laboratory building at the centre of “co-operate”, “NoMix” toilets have been installed, which experts from the Eawag Water Research Institute have developed over the past few years. Without changing the usual use, they separate human urine from the so-called black water from faeces, flushing water and toilet paper.

    Because urine contains valuable nutrients such as nitrogen, phosphorus and potassium, it can be used to produce fertiliser for agriculture. In a process specially developed by Eawag, the raw material is first stabilised in the basement of the NEST building using a biological process, thus losing its strong odour. An activated carbon filter removes all drug residues before the liquid is finally evaporated – to produce a high-quality fertiliser called “Aurin”, which is marketed by the Eawag spin-off Vuna GmbH. 1000 litres of urine produce 100 litres of this fertiliser, which since 2018 has also been approved by the Federal Office for Agriculture for use on edible plants.

    Many mosaic stones for a good carbon footprint

    In addition to the inconspicuous urine collection system, many obvious details document the campus’ claim to be a signpost for environmentally friendly construction. Photovoltaic installations will massively increase the campus’ own electricity production. And on more than 14,000 m2 of floor space, people move on recycled asphalt with a high proportion of 80 percent recycled material in the base layer and 20 percent in the thin surface layer.

    At the same time, the landscape architects have freely dispensed with asphalt in order to design close to nature: Previously sealed areas are “liberated”, such as Ludwig-Tetmajer-Strasse on the Empa site. “This ‘car park asphalt desert’ will become a green and shady zone,” explains Kevin Olas. And behind the large new buildings, biodiversity is also being promoted with diverse plants and trees – thanks to selected heat-resistant species that will also feel at home in future climate conditions.

  • «When it comes to energy, the construction and real estate industry must reinvent itself»

    «When it comes to energy, the construction and real estate industry must reinvent itself»

    Zur Person
    Pascal Bärtschi,
    Bauingenieur ETH, ist
    Vize-Präsident von
    Entwicklung Schweiz und seit 2015 CEO der Losinger Marazzi AG. Der 52-Jährige leitete zuvor bei Losinger
    Marazzi die Region Mitte (Bern-Freiburg-Basel).

    Wo sieht der Branchenverband Entwicklung Schweiz seine Kernaufgaben?
    Wir vertreten Unternehmen, die in der Lage sind, Gesamtleistungen zu übernehmen. Also solche, die von der Projektentwicklung bis und mit Realisierung alles abdecken können. Unsere Hauptaufgabe sehen wir darin, mit unseren Kunden, Investoren, den zuständigen Behörden wie auch mit politischen Verantwortlichen übergeordnete Themen wie etwa Verdichtung und Raumplanung auf einer entsprechenden Flughöhe zu besprechen. Unsere Mitglieder erhalten so die Möglichkeit, via Entwicklung Schweiz mit den zuständigen Personen in Dialog zu treten. Darüber hinaus haben wir als Verband verschiedene Positionspapiere verfasst – derzeit entsteht zum Beispiel gerade ein Positionspapier zur Frage, was man unter Qualität eines Bauprojekts versteht.

    Von welchen Vorteilen profitieren Ihre Mitglieder?
    Wir organisieren für unsere Mitglieder und assoziierte Partner regelmässig Anlässe, bei denen sie sich mit Stakeholdern wie Politikern oder Investoren austauschen können. Darüber hinaus ist es deutlich einfacher als Verband, Gespräche zu übergeordneten Themen mit Kantonen oder auch Instanzen wie zum Beispiel dem Bundesamt für Bauten und Logistik (BBL) zu führen, als wenn dies jedes Mitglied für sich tun müsste. Gerade bei regulatorischen Themen profitieren unsere Mitglieder von der direkten Schnittstelle zur Politik, die wir dank unserem Präsidenten, Ständerat Martin Schmid (FDP), haben. Er ist Rechtsanwalt und somit nicht in der Branche tätig, was wir als weiteren Vorteil sehen.

    Welchen Einfluss hat der Verband in der Schweiz und insbesondere auch in Bundes-Bern?
    Wir bieten den Ämtern, Investoren und unseren Kunden eine bewährte Schnittstelle. Ich bewerte unseren Einfluss als gut. Wir haben uns als Gesprächspartner der grossen Instanzen sehr gut etablieren können. Die Immobilienbranche ist dezentralisiert aufgestellt. Für uns ist es deshalb wichtig, dass wir nicht nur in Bern Gehör finden, sondern auch bei den Kantonen und Gemeinden. Denn ein Projekt wird von einer Gemeinde oder einem Kanton bewilligt. Dank unserem Präsidenten und den Kontakten der Geschäftsstelle haben wir einen guten Draht zu Bundes-Bern, was natürlich hilft, wenn es um Themen wie etwa das Raumplanungsgesetz geht.

    Braucht es so einen Verband zwingend für eine erfolgreiche Zukunft der Baubranche?
    Ich würde sagen, es ist wichtig und notwendig, dass ein solcher Verband existiert. Die Zahl der Schweizer Gesamtdienstleister in der Immobilienbranche ist überschaubar. Unser Verband kann diese Unternehmen optimal auf den verschiedenen Ebenen vertreten.

    Welche Verantwortung nimmt Entwicklung Schweiz in Bezug auf die Wohn- und Lebensqualität bei Bauprojekten wahr?
    Wir setzen unseren Mitgliedern keine Rahmenbedingungen. Die Wahrnehmung der Wohnqualität ist jedoch auf jeden Fall gegeben, da wir uns als Entwicklung Schweiz mit damit zusammenhängenden Themen wie Lärmschutz, Verdichtung nach innen und Raumplanung intensiv auseinandersetzen. Aber bei uns ist jedes Mitglied selbst dafür verantwortlich, die Projekte entsprechend zu entwickeln und die nötige Qualität zu liefern. Man darf nicht vergessen, dass sich die Mitglieder in einer Wettbewerbssituation befinden.

    «
    CO2-arme
    Baumaterialien, flexiblere
    Umnutzungen
    »

    Welche Bedeutung hat die Energiestrategie 2050 für den Verband?
    Die Energiestrategie hat eine grosse Bedeutung für uns. Wir versuchen, Partner und Kunden dafür zu sensibilisieren. Der CO2-Verbrauch in der Immobilien- und Baubranche ist immer noch relativ hoch. Der eine Teil fällt beim Bau an, der andere während des Lebenszyklus einer Immobilie. Geht man von einem Lebenszyklus einer Liegenschaft von 60 Jahren aus, haben Entscheidungen, die heute für einen Neubau getroffen werden, langfristige Auswirkungen. In diesem Zusammenhang wird sich die Immobilien- und Baubranche neu erfinden müssen.

    Wie meinen Sie das?
    Vor zehn Jahren fielen etwa 50 Prozent der CO2-Emmissionen bei der Herstellung der Baumaterialien sowie in der Bauphase selbst an. Die anderen 50 Prozent fielen auf den Unterhalt einer Liegenschaft. Heute sind wir, was Unterhalt und Betrieb eines Gebäudes betrifft, bei etwa einem Drittel des CO2-Ausstosses; bei der Herstellung der Baumaterialien sowie dem Bau selber bei zwei Dritteln. Wir müssen uns Gedanken machen, wie wir den CO2-Fussbadruck einer Immobilie reduzieren können. Eine Lösung besteht darin, dass man wirklich nur die für ein Gebäude notwendige Fläche bebaut. Ein anderer Ansatz ist die Wahl der Materialien – heute gibt es bereits CO2-armen Beton oder die Möglichkeit des umweltfreundlichen Holzbaus. Ausserdem müssen bestehende Strukturen später umgenutzt werden können. Schauen wir uns die Investitionen in der Immobilienbranche an, fallen 99 Prozent auf Neubauten und nur 1 Prozent geht in Sanierungen. Hier sehen wir Handlungsbedarf.

    Wie hat die Bau- und Immobilienbranche die Pandemie bis jetzt bewältigt?
    Die Baubranche ist relativ gut durchgekommen – es gab wenig Umsatzeinbussen, da die Baustellen mit Ausnahme des Kantons Genf auch während des Lockdowns offengeblieben sind. Etwas schwieriger gestaltete sich die Immobilienentwicklung. Die Entwicklung eines Projekts startet in der Regel mit einem Quartierplan und einer Baubewilligung. Die Pandemie hat vieles ausgebremst. So mussten Gemeindeversammlungen, bei denen beispielsweise über ein Vorhaben abgestimmt werden sollte, häufig verschoben werden. Damit verschiebt sich automatisch auch das Projekt. Bei der Bearbeitung der Baugesuchdossiers hat man die Verlagerung zur Arbeit im Home-Office gespürt: Der Austausch wurde erschwert; es hat alles etwas mehr Zeit in Anspruch genommen, was wiederum zu Verzögerungen geführt hat.

    Zeichnet sich beim Arbeitsleben durch die Pandemie eine Veränderung ab?
    Die Pandemie hat Tendenzen, die sich schon vorher abgezeichnet haben, beschleunigt. Ein Beispiel hierfür ist die pro Person weniger benötigte Bürofläche. Bei der Konzeption von Wohnungen dürfte die Berücksichtigung des immer öfter benötigten Home-Office langfristig Einfluss haben. Wobei dies nicht zwingend in einem zusätzlichen Arbeitszimmer in der Wohnung selber resultieren muss. Ich kann mir gut vorstellen, dass man innerhalb eines Quartiers verschiedene kleine Co-Working-Spaces entwickelt. Diese könnten auch Mischnutzungen aufweisen, also beispielsweise über Mittag als Restaurant fungieren.

    Wohnen die Menschen in der Romandie anders als in der Deutschschweiz?
    Die Nachhaltigkeitsaspekte werden zurzeit in der Romandie noch weniger wahrgenommen als in der Deutschschweiz. Ich vermute, das kommt daher, dass die grünen Tendenzen zunächst aus Deutschland kamen und somit zuerst die Deutschschweiz erreicht haben. Auch im Bereich des Öffentlichen Verkehrs hat die Deutschschweiz einen gewissen Vorsprung – wobei die Romandie hier am Aufholen ist.

    Welche Meilensteine hat Entwicklung Schweiz in den letzten Jahren erreicht?
    Der wichtigste Punkt ist sicher, dass wir heute etablierte Ansprechpartner für übergeordnete Themen auf Stufe Kantone und Bund sind.

  • Sika supports the introduction of Swiss eco-cement

    Sika supports the introduction of Swiss eco-cement

    LC3 stands for Limestone Calcined Clay Cement and was developed by the Swiss Federal Institute of Technology in Lausanne ( EPFL ). It is a sustainable cement product that has a clinker content that is up to 50 percent lower than that of traditional cement. Clinker makes a significant contribution to CO2 emissions during cement production. In LC3, a large proportion of clinker is replaced with a new additive, which means that overall less CO2 is emitted in cement production.

    The Zug-based construction chemicals group Sika wants to support the market launch of LC3, as he writes in a press release. He wants to develop and offer special cement additives and concrete admixtures that help customers adapt their materials to the properties of LC3. This should enable the water consumption, workability, hardening and durability of the LC3 concrete to remain the same compared to conventional products. According to its own statements, Sika is also ready for “comprehensive product tests with interested customers”.

    "With these new LC3 products, we are putting the goals of our sustainability strategy into practice," said Frank Höfflin, Sika's head of technology, in the press release. “Our aim is to act as an enabler for sustainability in the construction industry and to develop more environmentally friendly and more efficient products,” he emphasizes.