"It's time to take the ecological crisis seriously"

Pandemics are only one facet of global change. © iStock

Pandemics are only one facet of global change. © iStock

In an opinion piece published in Le Temps, a group of 120 scientists – including 13 from EPFL’s School of Architecture, Civil and Environmental Engineering (ENAC) – offer a timely reminder of how our disregard for nature is to blame for the COVID-19 pandemic.

The COVID-19 pandemic was unimaginable for many and has given rise to the worst kind of conspiracy theories. For a large number of researchers, however, a widespread epidemic came as no surprise. In early 2018, the World Health Organization (WHO) even added “Disease X” to its list of “blueprint priority diseases.” It called on governments to plan ahead and stop the processes that cause mass epidemics, rather than just respond to diseases as they emerge.

Many laboratories around the world are devoting their efforts to understanding the epidemiological dynamics of emerging infectious diseases such as COVID-19. Some pandemics have already occurred, and it is almost certain that more will follow. The health, medical, social and economic problems we are discovering and experiencing right now are enormous. But these are not the only problems we need to solve.

The current epidemic belongs to the group of zoonoses, or diseases that link wildlife, domestic animals and humans. Humanity will always encounter viral, microbial and parasitic species for which it is neither adapted nor prepared.

It is estimated that the world’s 5,400 known mammal species are home to some 460,000 species of viruses, the vast majority of which are yet to be described. Most of these viral species are harmless to humans. Yet even a small percentage of infectious species represents a formidable pool of aggressors. For years, we have been dealing with HIV, Ebola, Dengue, Zika, Chikungunya, Lassa fever, SARS, H5N1, H1N1 and many other emerging diseases that, because they are less spectacular, have failed to make the headlines. But their numbers seem to have been rising steadily for half a century and epidemic episodes are becoming more and more frequent.

Problematic footprint

Wild mammals now represent only 5% of land-dwelling mammals by biomass, with humans and domestic animals accounting for the remaining 95%. One might believe that the threat of a virus passing from wild mammals to humans would therefore diminish. Rather, the opposite is happening because of humanity’s pervasive footprint in every corner of our planet. As the Intergovernmental Science-Policy Platform on Biodiversity and Ecosystem Services noted in its 2019 Global Assessment Report, our global footprint is becoming problematic, with 75% of terrestrial ecosystems and more than 65% of marine ecosystems significantly modified by human activities. These alterations are severely fragmenting natural landscapes and leading to biodiversity loss on a worrying scale. The resulting disruption of wild animal species’ food chains can cause behavioral changes that push some species to exploit resources linked to human activities, thereby increasing the risk that pathogens could be transmitted to humans or domestic animals.

Taking into account the limits

The viruses threatening humanity today are benefitting from this global expansion of interconnections between their potential hosts. For example, one such virus was still completing its life cycle in a bat population somewhere in Asia in the fall of 2019. It emerged in a Chinese market a few months later before spreading worldwide in March 2020. It seems that the virus we now know as SARS-CoV-2 came into contact with another virus carried by pangolins, picking up a gene that is particularly aggressive to humans in the process.

Pandemics are only one facet of global change. Equally worrying is the mass extinction of species caused by the transformation of natural environments, including habitat loss, resource extraction, widespread air, water and soil pollution, and climate change. We are now faced with the consequences of our actions, resulting from the economic and political choices that we as a species have made. Achieving sustainable development will require us to make different choices – choices that preserve, rather than destroy, natural environments. Just as the IPCC does for climate, the IPBES publishes a wealth of scientific facts and knowledge that governments can use to learn about the challenges of ecosystem and biodiversity conservation, and how to respond to them. People and organizations across society, starting with elected officials and politicians, should take advantage of this information to implement national and supranational policies that are commensurate with the challenges we face.

Locks to be lifted

This need for political action inevitably shines a spotlight on the obstacles to better governance of our interactions with the biosphere and consideration of its sustainable limits. We, the undersigned, call on political leaders to act without delay on the causes of this dramatic pandemic in order to prevent future outbreaks, and to adopt a whole-systems approach that considers both our needs and our relationship with all living organisms.

In order to bring about the necessary changes, we call for innovative measures to counter climate change, to protect biodiversity, to preserve the rainforest and natural terrestrial and aquatic habitats, and to do everything possible to promote sustainable land use, as well as economic measures that allow us to significantly reduce our environmental footprint.

Following the program “Naviguons à vue,” broadcast on RTS on 30 March 2020, and based on an opinion piece published in Libération on 8 April and on several scientific papers and articles in the European press, it is now time to draw the attention of Swiss compatriots to the scientific evidence showing the link between the emergence of pandemics and human disturbance of the natural environment.

Signatories (in alphabetical order)

Prof. Alexandre Aebi (UNINE), Prof. Jake Alexander (ETHZ), Prof. Raphaël Arlettaz (UNIBE), Prof. Sven Bacher (UNIFR), Prof. Andrew Barry (EPFL), Prof. Jordi Bascompte (UZH), Prof. Tom Battin (EPFL), Prof. Alexis Berne (EPFL), Prof. Rizlan Bernier-Latmani (EPFL), Prof. Cleo Bertelsmeier (UNIL), Prof. Louis-Félix Bersier (UNIFR), Prof. Marie Besse (UNIGE), Prof. Wolf Blanckenhorn (UZH), Dr. Kurt Bollmann (WSL), Dr. Med. Riccardo Bondolfi, Dr. Florian Breider (EPFL), Dr. Jakob Brodersen (EAWAG), Prof. Alexandre Buttler (EPFL), Prof. Marc Chesney (UZH), Dr. Nathalie Chèvre (UNIL), Prof. Philippe Christe (UNIL), Prof. Sandra Citi (UNIGE), Prof. Elena Conti (UZH), Dr. Daynah Payne (UNIBE-GMBA), Dr. Luiz F. De Alencastro (EPFL), Prof. Jacques Dubochet (UNIL), Prof. Peter Duelli (WSL), Dr. Andreas Fliessbach (FIBL), Prof. Marion Fresia (UNINE), Dr. Luca Fumagalli (UNIL), Prof. Blaise Genton (Unisanté), Prof. Jaboury Ghazoul (ETHZ), Dr. Christophe Giobellina (HUG) , Prof. Adrienne Grêt-Regamey (ETHZ), Prof. Charlotte Grossiord (EPFL-WSL), Prof. Benoît Guery (CHUV), Dr. Thomas Guillaume (Agroscope), Prof. Antoine Guisan (UNIL), Dr. Philippe Hauser (CHUV), Prof. Janet Hering (EAWAG-EPFL-ETHZ), Dr. Felix Herzog (Agroscope), Dr. Angelika Hilbeck (ETHZ), Prof. Christof Holliger (EPFL), Dr. Marcel Hunziker (WSL), Prof. Bastiaan Ibelings (UNIGE), Dr. Mauro Jermini (Agroscope), Prof. Vincent Kaufmann (EPFL), Prof. Laurent Keller (UNIL), Prof. James Kirchner (ETHZ), Prof. Christian Klug (UZH), Prof. Tamar Kohn (EPFL), PD Dr. Eva Knop (Agroscope), Prof. Jacob Koella (UNINE), Prof. Barbara König (UZH), Dr. Maike Krauss (FIBL), Prof. Michael Krützen (UZH), Prof. Anna Liisa Laine (UZH), Prof. François Lefort (HEPIA), Prof. Anthony Lehmann (UNIGE), Prof. Laurent Lehmann (UNIL), Prof. Michael Lehning (WSL-EPFL), Prof. Peter Linder (UZH), Dr. Jean-Luc Loizeau (UNIGE), Dr. Josep Oriol Manuel (CHUV), Dr. Pierre Mariotte (Agroscope), Dr. Oliver Martin (ETHZ), Dr. Blake Matthews (EAWAG), Prof. Michel Mayor (UNIGE), Prof. Anders Meibom (EPFL), Prof. Peter Messerli (UNIBE), Prof. Pascal Meylan (UNIL), Prof. Edward Mitchell (UNINE), Dr. Marco Moretti (WSL), Prof. Heinz Müller-Schärer (UNIFR), Prof. Athanasios Nenes (EPFL), Prof. Pascal Niklaus (UZH), Dr. Martin Obrist (WSL), Prof. John Pannell (UNIL), Prof. Christian Parisod (UNIBE), Prof. Raffaele Peduzzi (UNIGE), Dr. Sandro Peduzzi (UNIGE), Prof. Loïc Pellissier (ETHZ-WSL), Prof. Owen Petchey (UZH), Dr. Bertrand Piccard (Fondation Solar Impulse), Dr. Francesco Pomati (EAWAG), Prof. Jérôme Pugin (HUG), Prof. Sergio Rasmann (UNINE), Prof. Andrea Rinaldo (EPFL), PD Dr. Anita Risch (WSL), Prof. Marc Robinson-Rechavi (UNIL), Prof. Alexandre Roulin (UNIL), Prof. Walter Salzburger (UNIBAS), Prof. Marcelo R. Sanchez-Villagra (UZH), Prof. Ian Sanders (UNIL), Prof. Maria J. Santos (UZH), Prof. Michael Schaepman (UZH, World Biodiv. Forum), Prof. Gabriela Schaepman-Strub (UZH), Prof. Florian P. Schiestl (UZH), Prof. Bernhard Schmid (UZH), Prof. Knut Schmidtke (FIBL), Prof. Christian Schöb (ETHZ), Prof. Rainer Schulin (ETHZ), Dr. Martin Schütz (WSL), Prof. Tanja Schwander (UNIL), Prof. Ole Seehausen (UNIBE-EAWAG), Prof. Irmi Seidl (UZH-WSL), Prof. Sonia I. Seneviratne (ETHZ), Prof. David Shore (UNIGE), Prof. Vera Slaveykova (UNIGE), Dr. Eva Spehn (Acad. Suisse. Scie. Nat.), Prof. Konrad Steffen (WSL-ETHZ-EPFL), Dr. Serge Stoll (UNIGE), Dr. Lucius Tamm (FIBL), Prof. Joseph Tarradellas (EPFL), Dr. Josh Van Buskirk (UZH), Prof. Marcel Van Der Heijden (Agroscope-ZH), Prof. Erica Van De Waal (UNIL), Prof. Urs Von Gunten (EPFL-EAWAG), Dr. Jean-Pierre Vermes (Centro Medico TI), Dr. Pascal Vittoz (UNIL), Ing. Agr. Gaby Volkart (Ateliernature), Prof. Gretchen Walters (UNIL), Prof. Alex Widmer (ETHZ), Prof. Walter Wildi (UNIGE), Prof. Yvonne Willi (UNIBAS), Dr. Sonja Wipf (Swiss Nat. Park), Prof. Niklaus Zimmerman (WSL-THZ)

Opinion piece published on 5 May 2020 in Le Temps


Author: Group of 120 scientists