Drivers and Barriers Toward Healthy and Environmentally Sustainable Eating in Switzerland: Linking Impacts to Intentions and Practices

Food consumption is among the activities with the most significant environmental impacts, and furthermore contributes to rising health costs. We explored the factors that foster or hinder healthy and sustainable eating in Switzerland. Based on an online household survey with 620 respondents, we first determined the disability adjusted life years and greenhouse gas impacts associated with individuals' dietary habits to measure healthy and environmentally sustainable eating. We then relate the nutritional health and environmental impacts to individual's intentions, and explore what interpersonal and societal factors foster or hinder healthy and sustainable eating. Results suggest that intentions for healthy eating are stronger than intentions to eat environmentally sustainable and that intentions for healthy eating transmit better into behavior than intentions for environmentally sustainable eating. Males and females had similar intentions but males showed substantially higher dietary related health impacts with 12 min of healthy life lost per day and 14% higher carbon footprint than females. Furthermore, vegan and vegetarian diets yielded very high nutritional health benefits of >23 min of healthy life gained per person and day, mostly realized through the reduced intake in processed and red meat and increased consumption of nuts, wholegrain, and to a lesser extent in fruits and vegetables. Meatless diets show concurrent high reductions in the carbon footprint of −42% for vegetarians and −67% for vegan. A key obstacle to healthier and more environmentally sustainable eating is that people do not recognize the high nutritional and environmental co benefits of vegetarian and vegan diets. This suggests that policies promoting healthy eating can target factors affecting intentions, while measures targeting environmentally sustainable eating should aim at overcoming the intention behavior gap, by informing on e.g. the importance of reducing meat consumption toward environmental sustainability.

Drivers and barriers towards healthy and environmentally friendly eating habits in Switzerland

Ivo Philippe Baur, Claudia Rebeca Binder Signer, Ralph Hansmann

Food consumption in Switzerland is the activity with the largest environmental impact, which also contributes significantly to rising health costs. Therefore, it is a crucial societal aim to better understand the drivers and barriers to healthy and sustainable diets. To do so, we conducted an online household survey in Switzerland and collected 620 responses. Based on dietary habits that people reported, we calculated the kg C02 equivalent for the individuals’ diets as a measure for environmental impact. As measure for health impacts, we calculated the disability-adjusted life year (DALY) associated with individual level diets. Structural equation modeling showed that the intentions to eat healthy are more pronounced and better transmit into behavior than environmentally friendly eating. In contrast the intention to eat environmentally friendly is less pronounced and does almost not result in environmental friendlier eating habits. This suggest that healthy eating is of higher priority to consumers and firmer executed than environmentally friendly eating. Furthermore, we use regression models to explore the factors fostering intentions, behavior, and the gap between. We find that female, age, vegetarian diets, stable relationship, contribute positively to dietary habits. Surprisingly, neither education nor income lead to stronger intentions or healthier or more sustainable food choices. In contrast, people living in cities and in the German speaking part of Switzerland have strong intentions that do not transmit into behavior. This suggests that healthy and sustainable eating in Switzerland is not determined by socio-economic status, but rather by regional cultures and corresponding eating habits.

2020

Environmental impacts and benefits of information and communication technology infrastructure and services, using process and input-output life cycle assessment

Yves Jon Césare Loerincik

Sustainable development and the Information Society are two concepts that are not commonly associated. However, both could have a major impact on the other. Information and communication technologies (ICT) may have important negative impacts on the environment. At the same time, ICT can also bring improvements. To provide guidance on how ICT devices and applications can be oriented towards positive effects, new methodology and tools are needed to understand and assess these various effects. In that respect, Life Cycle Assessment (LCA) is a pertinent approach, potentially enabling a holistic and in-depth analysis. This thesis proposes to develop appropriate Life Cycle tools and methodology and to apply them to measure the sustainability of ICT devices and of their applications. Specific objectives are: to explore the possibilities of combining Process LCA (PLCA) and Input-Output LCA (IOLCA), and to develop an operational method for ICT applications; to apply the developed method to assess the direct impacts of a computer network, including software and maintenance and developing strategies, to account for the high renewal rate in ICT technologies; to extend the method to consider not only negative impacts, but also benefits of ICT; to develop a method to address effects on lifestyles and rebound effects, and apply it to assess the impacts and benefits of innovative ICT services; Chapter 1 is a short introduction describing the environmental impacts of ICT and how this work addresses them. Chapter 2 presents the main methodological developments: It looks in detail at how PLCA and IOLCA can be compared and used in a complementary way. A method is developed to compare the two approaches in detail and to evaluate the cut-offs processes – the processes that are not traditionally considered in a PLCA – of two specific ecoinvent processes. The conclusions are that a full integration of PLCA and IOLCA remains difficult with our present level of knowledge. IOLCA could be use to complement PLCA when no other evaluation is available, but IOLCA should also be used as a quality check for PLCA and to determine priorities. Chapter 3 assesses comprehensively the environmental impacts of the computer network of the Ecole Polytechnique Fédérale de Lausanne. The LCA shows that the computers have the highest environmental impact, but also that short-term technology changes can reduce significantly their impact. The use phase dominates the impacts, but the production phase is also significant. Finally, using the Input-Output (IO) approach leads us to the conclusion that the service-linked contribution included in the total cost of ownership - that is, all of the costs associated with the computer network - has a significant impact on the environment. Chapter 4 evaluates the impacts and benefits of the ICT application to help the management of urban networks. The CREM, in Switzerland, uses a telemonitoring system to assess the water, electricity, district heating, and natural gas networks to increase the efficiency of their management. We want to know how the environmental and economical costs of the infrastructure and its maintenance compare with the savings. An LCA has been performed using a tiered hybrid approach. It shows that the savings overcome largely the cost and environmental impacts of the infrastructure. Chapter 5 analyses an innovative service developed by France Telecom. The visiophonic station enables the substitution of physical interviews by virtual interviews. A PLCA of the service shows that the saved km due to the shift from physical to virtual interviews dominates the effects on the environment and that the potential savings are therefore important. However, depending on what is consumed when using the time and financial resources made available by the service, the related impacts counterbalance the savings. Rebound effects must therefore be considered, studied, and addressed in the development as well as the implementation of new ICT services. Chapter 6 concludes with recommendations towards environmental beneficial uses of ICT and identifies what is needed for the necessary further LCA developments.

EPFL2006

SensorScope: Out-of-the-Box Environmental Monitoring

Guillermo Barrenetxea Kobas, Olivier Couach, François Ingelrest, Marc Parlange, Martin Vetterli

An important field of application for wireless sensor networks is environmental monitoring. Given the importance of potential climate changes, environmental impact on cities, and pollution, it is an application domain where sensor networks can have great impact and as such is getting more and more attention. Current data collection techniques are indeed rather limited and make use of very expensive sensing stations, leading to a lack of appropriate observations. In this paper, we present SensorScope, a collaborative project between environmental and network researchers, that aims at providing an efficient and cheap out-of-the-box environmental monitoring system based on a wireless sensor network. We especially focus on data gathering and present the hardware and network architecture of SensorScope. We also describe a real-world deployment, which took place on a rock glacier in Switzerland, as well as the results we obtained.

2008

Environmental impacts and benefits of information and communication technology infrastructure and services, using process and input-output life cycle assessment

Yves Jon Césare Loerincik

EPFL2006