ETH News

A sustainable transition to a climate-friendly and biodiversity-rich Switzerland is only possible if we tackle the energy transition, climate change mitigation and biodiversity loss together. This will not be easy, but it is worthwhile and ultimately indispensable, says Reto Knutti.

While living matter can advance technology and render human activities more efficient and eco-friendly, the way in which we currently fabricate materials containing living cells is far from sustainable. Miriam Filippi calls us to rethink our biofabrication practices.

Southern Europe is currently battling a heat wave. Jan Carmeliet explains how cities can tackle the summer heat. It is a balancing act that calls for finely tuned measures.

Despite a wet and grey June, summers in Switzerland are getting hotter than expected. The increased summer temperatures harbour risks that we are not well prepared for, says Dominik Schumacher.

The federal government has plans to tax electric vehicles to secure funding for road infrastructure. However, a new levy could delay the switch to electromobility. Alessio Levis explains how this dilemma could be resolved.

Renewable energies are not the main driver of biodiversity loss. It is rather the other way round: renewables can limit climate change in order to preserve biodiversity. Cyril Brunner contextualises the trade-offs from a scientific perspective.

We can transition to pesticide-free agriculture without converting to organic farming. Robert Finger outlines the advantages and challenges involved.

Recycling is an accepted formula for sustainable resource use, but in the case of plastic it can have serious side effects, says Helene Wiesinger ¨C and uses the example of plastic flooring in Switzerland to illustrate the dilemma.

Vacant land, community gardens and public parks are key resources for liveable cities. Fritz Kleinschroth calls on urban planners to focus on giving nature more space and on granting equitable access to green spaces.

Achim Walter believes increased cultivation of legumes would bring major benefits. But how to persuade farmers in Switzerland to make the switch?

For Anthony Patt, Europe¡¯s ambitious plans for a hydrogen economy may be too ambitious, tipping the scales towards the interests of the fossil fuel industry, rather than energy consumers and the climate. Switzerland should be careful before jumping fully on board, he argues.

As Thomas Bernauer sees it, information on the impact that different segments of the population have on the climate is an essential ingredient in making climate policy measures fair and acceptable to the majority.

More and more people are afraid of climate change. For Cyril Brunner, this also has to do with how we talk about climate. We should focus less on problems and instead spend more time discussing solutions, suggests the climate researcher at the start of the year.

The Alps are being increasingly affected by floods and droughts. According to Manuela Brunner, we can do something about this problem: use water more sparingly and think about hazard protection in broader terms.

An extraordinary heat wave is assailing the world¡¯s oceans with an intensity that is surprising climate researchers. Environmental physicist Nicolas Gruber provides some context.

Through a new bilateral carbon trading pact, Switzerland is poised to fund thousands of household biogas reactors in Malawi. Marc Kalina has worked with biogas projects across Southern Africa and explains why they often fail to make their promised impact.

Malte Toetzke calls for more ambitious standards in the voluntary carbon offset market. While this would lead to fewer projects getting funded, the benefit for the climate would be greater overall.?

Innovative production technologies are crucial to the chemical industry¡¯s net-zero endeavour ¨C but they¡¯re not always enough, says Paolo Gabrielli.

Gabriela Hug ¨C an expert in power transmission networks ¨C argues that securing an affordable energy supply from renewable sources is not a utopian ideal for Switzerland, but rather a practical and feasible necessity.

To decarbonize our economy, electricity will replace oil and natural gas as the primary energy carrier. Where should that power come from? Many people argue that all of it should be produced domestically. Careful analysis suggests some share of it should be imported, says Anthony Patt.

Political debate is vital for a functioning democracy. And when it comes to complex issues such as climate change, scientists should be able to share their expertise and help shape opinion, says Reto Knutti.

Focusing exclusively on new housing developments to counter the housing crisis is not sustainable, says David Kaufmann. His research group has been able to show that vulnerable persons are displaced to a much greater extent than previously thought in the Swiss canton of Z¨¹rich.

Europe¡¯s energy transition will not succeed without access to essential metals like rare earths, says security researcher Julian Kamasa. Responsible mining and recycling of critical raw materials could help Europe reduce dependence on imports and meet its climate targets. ?

Efforts to restore degraded ecosystems have so far fallen short of meeting global targets. Sound restoration must better incorporate social processes promoting equity in order to effectively benefit people, climate and biodiversity, says Sara L?fqvist.

There has been a great deal of media focus on the near-total lack of snow in Swiss ski resorts at the beginning of the year. Sonia Seneviratne explains why we will have to get used to this scenario and what needs to be done about it.

A nature-based economy that regenerates ecosystems and stops species extinction? Christoph K¨¹ffer believes this is possible if we strengthen ecology in research and education and make ecological expertise a basic skill for society. ?

Daniel Angerhausen believes that fundamental research is essential, especially in the current crisis. Still, he wonders if we shouldn¡¯t extend the idea of sustainability into the infinite reaches of outer space.

While the insufficient measures increasingly argue against reaching the 1.5-degree target, we could still achieve it with a rapid reduction in methane emissions, writes Cyril Brunner.

The promise of industrialised countries to financially support emerging and developing countries in climate measures remains unfulfilled at the beginning of the climate conference in Egypt. Florian Egli explains what the states are negotiating at COP27 and what could help to alleviate the loss of trust.

Agriculture practices that preserve resources? Enough food to make sure that everyone can enjoy a healthy and balanced diet? We still are a long way from that, finds Robert Finger ¨C and outlines the most important fields of action to make the food system more sustainable.

While the economic impacts of climate policy are generally perceived as costs, Anthony Patt proposes the opposite perspective. For Switzerland, converting the energy system and reaching the net-zero target may net benefit the economy, he finds.

The 2022 summer?has shown us again how climate is becoming more extreme year by year. Sticking to business-as-usual and counting on adaptation alone will not work. Only a rapid phase out of fossil fuels will prevent the worst, says Sonia Seneviratne. ?

We like to perpetuate the idea of a divide in the attitudes of city dwellers and country people as part of debates on the environment, but it¡¯s simply not the reality, explains Thomas Bernauer. In fact, there is little evidence of a fundamental urban-rural disconnect in Swiss environmental policy.

Much controversy surrounds the Neugasse project in the city Zurich. Spatial development scientist Sibylle W?lty shows how this area could contribute to alleviating the housing shortage: by building more densely than currently planned.

An ETH risk researcher has concluded that Energy Strategy 2050 doesn¡¯t work. The Energy Science Center at ETH Zurich disagrees: extensive research shows that the energy transition is feasible and makes sense, writes Gabriela Hug together with her ESC colleagues.

Making the chemical industry sustainable means reducing not only its dependence on fossil raw materials but also its toxicity footprint. This is achievable if the industry reduces its product range, explains Martin Scheringer.

The Canton of Zurich recently adopted the net-zero 2040 climate protection target. Here Sibylle W?lty appeals for more 10-minute neighbourhoods, which, by making better use of the settlement area, will reduce emissions.

For Achim Walter, it¡¯s time we take responsibility for what we eat. As consumers, we have a right to demand a food system that serves the environment, promotes health and protects those in less affluent circumstances.

Nature is not a ¡®nice to have¡¯ ¨C it¡¯s our life support system. Dwindling biodiversity endangers the very foundation of our existence. A turnaround is possible, but only if we all want it, says Christoph K¨¹ffer.

To be more sustainable, the construction industry needs reliable service-life predictions for structures. Ueli Angst calls for a paradigm shift in forecasting the durability of reinforced concrete.

The surge in gas and oil prices triggered by Russia¡¯s invasion of Ukraine could help speed the energy transition. But high prices won¡¯t be enough to ensure it succeeds; smart policies are still needed, writes Florian Egli. ?

Anthony Patt has contributed to the new IPCC report on mitigation of climate change. Since the last report in 2014, the odds for phasing out fossil energy have changed; a net-zero world is achievable now, even if the way remains long.

Two-thirds of the world's population still lives on less than ten International Dollars a day. Although global inequalities remain gigantic, Adina Rom is convinced that living conditions can be sustainably improved for all.

Politicians and the media struggle with predictions. This is more a problem resulting from a poor understanding of uncertainties than from the reliability of models, argues Reto Knutti.

Thomas Bernauer contributed to the latest IPCC report on adaptation to climate change. He sees nature and good governance as our most important resources for coping with the effects of climate change.

Wanting to keep plastics in circulation is currently en vogue. According to Magdalena Klotz, however, high collection rates are of little use if recyclate only replaces virgin material to a limited extent.

Hydropower delivers renewable electricity, but comes with massive fish mortality ¨C a global dilemma that can only be addressed by true compromises, says Luiz Silva, and outlines how to find them.

Ambitions to make hydrogen a key energy carrier for a climate friendly future are misguided, says Anthony Patt. Wherever possible, including ground transportation and heating, we should replace fossil fuels with the direct use of renewable electricity.

The CO₂-reducing effect of the pandemic has fizzled out, as the Global Carbon Project confirms in its latest report on greenhouse gas emissions. Nicolas Gruber nevertheless identifies some bright spots.

It will take more than a long-term target for 2050 to achieve climate neutrality, says Reto Knutti. Policymakers must take a consistent approach towards net zero, and define a reduction path with specific measures and interim targets.

We often hear that Swiss consumers want their agriculture to be free from genetic engineering. But consumer acceptance of genetically modified crops is likely to be higher than the media leads us to believe, Angela Bearth says.

Climate researcher Sonia Seneviratne contributed to the latest assessment report of the Intergovernmental Panel on Climate Change (IPCC). As she highlights here,? the new report clearly demonstrates that we can¡¯t afford to lose any more time when it comes to climate change.

We know that CO2 is warming the planet. But if we want to understand its consequences and avert risks, more accurate weather and climate models are crucial, says Nicolas Gruber.

The level of self-sufficiency indicates the extent to which agricultural performance ensures food security. But it¡¯s not geared to the challenges that confront agriculture today, says Roman H¨¹ppi.

The benefits of strict climate policies are often underestimated in public debate, while the costs are generally overestimated, says Lucas Bretschger. Climate protection does not have a negative impact on economic development.

Although measures taken to mitigate the effects of climate change are generally associated with energy levies and high costs, the opposite is actually true: the switch to renewable sources is set to reduce energy prices significantly.

Extreme weather poses increasing challenges to the agricultural sector. New insurance models based on satellite data may reduce the risk of drought for farmers, writes Robert Finger.

The scientific community is taking a clear stand on the CO₂ Act. Given their expertise, they are not only permitted, but obliged to do so, asserts Reto Knutti.

Many cocoa farmers live in poverty ¨C yet the fairly traded chocolate bunny often stays on the shelves. We should pay more attention to origin when buying chocolate, believes Isabel G¨¹nther.

Microplastic pollution is a serious problem, but blanket bans won¡¯t solve the issue, says Denise Mitrano. We should regulate plastics more precisely to create incentives for both innovation and environmental safety.

For Switzerland to become climate neutral, there¡¯s no way around electric mobility. But to get e-cars going, the public must push for charging stations where people live, argues Anthony Patt.?

Chemical pollution is a global threat that demands for global action, says Zhanyun Wang. An interface body similar to the IPCC could help bridge the gap between science and policy.

There is little to suggest we¡¯ll be eating less meat any time soon. In the last post of 2020, Lukas Fesenfeld explains why a sustainable food supply system is still possible.

The guiding principle for global climate policy is shifting from mistrust to collaboration, says Anthony Patt. Interestingly, nations' answer to the coronavirus can help to clarify how.

Bans and simple measures alone won¡¯t solve the problems in plant protection. Robert Finger presses for a comprehensive pesticide policy.

Climate activists were sentenced yesterday in the second instance. Sonia Seneviratne explains why climate researchers got involved in this trial and expressed their views in a public statement.

To Achim Walter it¡¯s clear: the budding artificial intelligence will decisively advance agroecology. But before we can harvest the fruits of AI, computers still have a lot to learn.

Lorenz Keysser believes that in order to overcome ecological crises, we must recognise affluence as a main driver and fundamentally reconsider our economy and lifestyle.

Rather than delaying the much-needed restructuring, we should use recovery programs to reset the economy?on a sustainable?footing, urges Jochen Markard.

In shaking our society to its core, says Jaboury Ghazoul, Covid-19 shows that we must adopt a far broader perspective to tackle the complex socio-ecological problems humanity faces.

Working from home, distance learning, online shopping ¨C many African countries cannot easily adopt rich nations¡¯ measures against the coronavirus. Isabel G¨¹nther calls for international solidarity in the pandemic.

In crises such as coronavirus, the value of research and facts becomes clear. Even when experts don¡¯t (and can¡¯t) have all the answers, we¡¯ve got to listen to what they have to say, says Reto Knutti.

The Sustainable Development Goals (SDGs) set out the way to a more sustainable world. But the 17 goals are not yet firmly anchored in everyday university life. Christine Bratrich feels this has to change.

Planting a trillion trees is just one part of a broader solution to help fight climate change. Thomas Crowther argues for a holistic and principled approach to reforestation and cutting carbon emissions.

It¡¯s 2020 and Christoph Kueffer is now into his fifth year of (almost) not flying. Whereas not flying hasn¡¯t been difficult, talking about social change still is, he asserts.

Food wastage is no longer acceptable ¨C for both ethical and ecological reasons, says Claudio Beretta. But we¡¯ve only just started cracking down on it.

The world is not on track with regard to its CO₂ emissions. In order to achieve the Paris climate targets, we all need to show courage and commitment, says Nicolas Gruber.

Today¡¯s new buildings could easily last until 2050 and beyond. That's why we now need binding climate targets in the construction sector, argues Guillaume Habert.?

The two popular initiatives on drinking water and a ban on pesticides are justified, but inflexible. Bernhard Wehrli calls for a counterproposal to tackle the issue.

Amazonian fires are started by humans and they can be stopped by humans ¨C with partnerships, more investments in forest conservation and sustainable agriculture, argues Rachael Garrett.

Climate models are a success story, given that much of what they predicted has actually come true. Nevertheless, Reto Knutti points out in a blog post, researchers still need new models.

While forestry is the main reason for road building in the Congo Basin, not all roads result in deforestation. The decisive factor is how they¡¯re used, writes Fritz Kleinschroth.

CO₂-neutral synthetic fuels are technically feasible today and the best promise for decarbonizing aviation. The right policy instruments could turn promise into reality, writes Anthony Patt.

It¡¯s getting warmer, the gardens are in bloom ¨C spring at last! A deceptively idyllic scene. Something is missing. Christoph K¨¹ffer calls for us to stop looking the other way and take action.

The vision of a climate-neutral Switzerland by 2050 is neither radical nor utopian. Indeed, we should seriously pursue this goal given what is at stake, says Sonia Seneviratne.

Agricultural technology doesn¡¯t have a good reputation. And yet, developed intelligently, it¡¯s the key to enhancing sustainability and biodiversity in agriculture, says Achim Walter.

Notre Dame should not be rebuilt, argue Guillaume Habert and Alice Hertzog. In times of climate change and in light of the current religious landscape its reconstruction is no longer a priority.

The president of Brazil, Jair Bolsonaro, ushers in a new era of deforestation in the sad saga of Brazil¡¯s land conflicts. As consumers we should not be complicit in his agenda, says Jaboury Ghazoul.

Organic production is not a silver bullet, argues Adrian M¨¹ller, but it can play an important role in sustainable food systems with the right set of policy interventions.

Current European and Swiss policy measures are insufficient for addressing the Paris climate target, says Konstantinos Boulouchos and outlines a way to decarbonise mobility.

Young people are on a climate strike, and researchers are supporting their cause. Reto Knutti discusses an unexpected turn in the climate change debate and the role of science in society.

The Paris Agreement relies on voluntary and therefore weak commitments. But contrary to popular belief, if some countries ¡°free-ride¡±, this does not undermine the commitment of others, writes Thomas Bernauer.

A student, a doctoral student and a professor of the Department of Mechanical and Process Engineering explain how a sustainable teaching project emerged from the ETH initiative to reduce air travel.

We still know very little about how global ecosystems influence our climate. Tom Crowther thinks that the answer to climate change could lie in global ecological datasets.

Climate policy is most effective when it helps people use alternative energy sources, rather than when it makes fossil energy more expensive, argue Anthony Patt and Johan Lilliestam.

To stop climate change, saving energy matters less than switching to renewable energy. Indeed, says Anthony Patt, it isn¡¯t clear whether saving energy makes much of a difference at all.

Due to digitisation, ecologists are working less and less in the field. Christoph K¨¹ffer believes that we should not rely solely on digital data, and puts the case for field research.

When it comes to implementing the Paris Agreement, the long-term view of climate change dominates, says Lukas Fesenfeld. This is a wasted opportunity.

Flying is too cheap, reckons Renate Schubert. If fuel tax, CO₂ tax and VAT were charged, air tickets would be more expensive and there would be fewer false incentives.

Palm oil is a highly controversial product. However, replacing it with other vegetable oils could endanger land and water resources, argues Gabriele Manoli.