Collective scientific expertise

Based on rigorous methodology, and ensuring both quality and objectivity, institutional scientific expertise aims to enlighten public decision making and debates relating to major societal issues.

Scientific expertise in the service of public decision making and debate

Based on the multidisciplinary strength of the CNRS, collective scientific expert reviews gather and analyse dispersed scientific knowledge on an international level. The key objective is to help understand complex societal issues at the request of public decision makers, or via self-referral. Each expert review culminates in a report, a synthesis, and a summary accessible to a large audience.

It is distinct from research activity or studies aiming to produce new knowledge, or individual productions of expertise for the media, enterprises, etc.

This activity is overseen by the Mission for Scientific Expertise (MPES), which mobilises scientific collectives in accordance with a rigorous methodology ensuring the quality as well as the credibility of the expert review:


The dialogue between the CNRS (MPES) and the entity requesting the expert review (ministry or agency)—and other partner institutions as the case may—culminates in the drafting of specifications in connection with a clearly identified issue.


The MPES organises and supports the work of groups of experts, who produce a cross-referenced analysis of the subject.

It does so by mobilising researchers and scientific leaders from different disciplines, who are identified based on their scientific contributions in the field. These experts analyse a corpus consisting of thousands of scientific publications collected by documentalists. They collectively draft a full report and conclusions, with the latter also appearing in the form of a synthesis and a summary approved by the group.

Showcasing expertise

The expert review culminates in a published work, with all of the documents (report, synthesis, summary) being made available on the CNRS website.

The results of the expert review are presented during a report submission conference open to a broad audience.

The CNRS Institutional Scientific Expertise Charter

The CNRS Institutional Scientific Expertise Charter outlines four fundamental principles that ensure the quality and credibility of scientific expertise:


It is justified by the choice of experts based on their competence, activities, and scientific productions relating to the subject of the expert review.


This is ensured via the publication of reports, syntheses, and summaries for completed expert reviews, and of the methodology and governing principles for expert reviews that are ongoing. The list of experts and the relevant bibliographical references will also be made public upon completion of the review.


It is based on the confidentiality, throughout the review process, surrounding the expert review and the names of experts, with a view to protecting against external influence and potential pressure. This independence is strengthened in advance before expert selection by gathering and analysing their interests or ties in order to prevent conflicts of interest.


It stems from diversity within the composition of the group of experts, as well as the fact that the expert review proceeds via cross-referenced analysis of a bibliographic corpus constituted according to a rigorous method rather than a point of view.

The CNRS actors involved in collective scientific expertise


Created in 2022 within the CNRS Scientific Office, the Mission for Scientific Expertise (MPES) proposes and implements the CNRS’s strategy for institutional scientific expertise. It supervises the various stages of the expert review process in conformity with the CNRS Expertise Charter, in collaboration with CNRS management and governing bodies.


The Scientific Expertise Steering Committee

Presided over by the Chief Scientific Officer, it consists of the Chairman and CEO’s chief of staff and two appointed members. It plays an advisory role in connection with all MPES activities, and provides its opinion to the CNRS Chairman and CEO, who ultimately makes decisions regarding the launch and publication of collective scientific expert reviews, as well as the constitution of groups of experts.

The Monitoring Committee

It includes the entity requesting the expert review, representatives from CNRS scientific management, leaders, and the MPES. It is specific to each expert review, and takes part in framing and monitoring it.

Scientific leaders

They are scientists who have a broad vision of the subject, as well as the issues involved in the expert review. They steer the scientific aspects of the work conducted by the group of experts.


Scientists from French and international academic research are also sought out for their scientific expertise and contributions in the field. They collectively participate in all of the expert review’s work.

Ongoing expert reviews

CNRS scientists tasked with conducting an expert review are held to a certain reserve throughout the effort. All requests for information regarding ongoing expert reviews should be sent, with respect to the CNRS, to the MPES (

Scientists who would like to participate in an expert review are invited to present themselves to the MPES (, indicating the title of the expert review in question, justifying their competency in the field of expertise, and attaching their CV.

Plastics used in agriculture and for food (INRAE-CNRS)

Commissioned and funded by the French Environment and Energy Management Agency (ADEME), the Ministry of Agriculture and Food, and the Ministry of Ecological Transition, this collective scientific expert review conducted by the French National Research Institute for Agriculture, Food, and Environment (INRAE) and the CNRS aims to provide an overview of the scientific knowledge pertaining to the use of plastics in agriculture and food, their properties and impact throughout their life cycle, and their interrelation as part of an eco-conception approach.

The use of plastics has developed since the 1950s due to their highly interesting properties. However, since they are not (or are not very) degradable, and are therefore very persistent in the environment, plastic waste accumulates across trophic levels.

The public policies currently in effect or under preparation present ambitious objectives in terms of changes in the use and recycling of plastics. However, detailed knowledge of their uses–in addition to their properties, impact, composition, and methods of production–is needed to determine what could be banned, reduced, promoted, collected, and recycled as efficiently as possible. These questions are especially relevant to the agricultural and food sectors, which represent nearly half of the plastics used in France.

Commissioned and funded by ADEME, the Ministry of Agriculture and Food, and the Ministry of Ecological Transition, INRAE and the CNRS are conducting a collective scientific expert review to take stock of the current scientific knowledge regarding the use of plastics in agriculture and food, their prospects for evolution, and the properties required based on these uses. This expert review will focus on the scientific literature in order to characterize the properties of these plastics based on their composition, doing so over the course of their life cycle. It will highlight their environmental impact on the continent’s terrestrial and aquatic ecosystems, in addition to their impact on health. It will analyse how compromises relating to the expected properties of these plastics can be integrated within an eco-conception approach, and in conformity with health standards. It will be based on a review of regulations, with an emphasis on the use of plastics in Europe.

INRAE and the CNRS will ensure that the principles of competence, independence, impartiality, and transparency are adhered to in the completion of this collective scientific expert review. The review is planned to last two years beginning on 1 June 2022, and must be completed by a multidisciplinary collective of French and European scientists.

The ESCo on offshore wind turbines: The effects of offshore wind farms on marine and coastal biodiversity and socio-ecosystems

The French ministers for the environment, energy and the sea have mandated the French Research Institute for Exploitation of the Sea (Ifremer) and the CNRS to carry out a collective scientific expert review (ESCo) of the effects of offshore wind farms and their installations on marine biodiversity and marine and coastal socio-ecosystems.

Offshore wind farms play a key role in the drive to decarbonise the energy sector and thus in the ability of governments to ensure the energy sovereignty of their countries. As with any industrial use of equipment at sea, this new activity of course has an impact on biodiversity and marine and coastal ecosystems and the effects are the subject of a growing number of scientific publications. This is particularly the case in northern European countries where offshore wind energy development started several years ago.

The development of marine renewable energies clearly needs to integrate the preservation of biodiversity. In this context, the ESCo on Offshore Wind Farms aims to establish a state of the art and a critical summary of scientific knowledge based on the available scientific literature on the effects of offshore wind farms and their installations on marine and coastal environments and in all their dimensions. This ESCo will also specify whether knowledge acquired in another country can be transposed to the ecosystems of the French coasts. The expert review will highlight the effects of the various forms of pressure associated with offshore wind farms on all the physical and biological components of biodiversity and at different timescales. It will also highlight such effects on the associated marine and coastal socio-ecosystems that in turn have a feedback effect on biodiversity.

The Ifremer and CNRS will make sure the principles of competence, independence, impartiality and transparency are respected in work on this collective scientific expertise report which is scheduled to take two years from its start in November 2023. A multidisciplinary group of French and European researchers brought together on the basis of their scientific expertise are working on answering the central question through a study of several thousand publications. The deliverables will be made public in autumn 2025.

Completed expert reviews

Each collective scientific expert review culminates in a public report. This report is collectively approved by the group of experts, whose composition it presents. The CNRS is not responsible for the uses made by the reports and syntheses it publishes.

Acoustic impact of offshore wind projects on marine wildlife (November 2021)

This expert review was coordinated by the CNRS at the request of the Ministry of Ecological Transition, the Ministry of the Sea, and the Ministry of Higher Education, Research, and Innovation.


The notable increase in recent decades of underwater sound produced by human activity is a major concern for environmental actors due to its potential impact on marine organisms. The role of sound in the ocean is internationally recognized (Global Ocean Observing System, UNESCO), and is included within European regulation (Strategy for the Marine Environment framework directive). In this context, the development of offshore wind power has sparked debate due to the sound pollution it can generate.

This expert review provides an overview of the scientific knowledge relating to the acoustic impact of offshore wind projects on three categories of marine life–marine mammals, fish, and invertebrates–with there being few studies available for seabirds and sea turtles. It presents the mechanisms by which underwater sound propagates, as well as the numerous impacts on marine species of the sound generated by wind projects (during construction especially but also operation), notably by comparing them to other sound emissions of human origin, in addition to offering strategies for mitigation. It also underscores the incompleteness of current knowledge for multiple species and types of sound sources.

Other expert reviews involving the CNRS before the creation of the dedicated institutional mission

Eutrophication: manifestations, causes, consequences and predictability (November 2017)

This expert review was coordinated by the CNRS in partnership with Ifremer and Irstea at the request of the Ministry of Agriculture and Food and the Ministry of Ecological Transition, with funding from the French Biodiversity Agency.


Eutrophication is the most visible manifestation of the pollution of water by organic matter and nutritive elements (nitrogen, phosphorus) arising from human activity. It results in excessive algal growth and the depletion of water oxygen concentration, leading to major disturbances for aquatic ecosystems. It has an impact on human health and associated activities, thereby making it a socially sensitive issue.

This expert review provides a critical overview of the available international scientific knowledge on the causes, mechanisms, consequences, and predictability of eutrophication. It also strives to clarify the definition of eutrophication by taking into account the land-sea continuum. In considering the needs and operational issues relating to public action, it identifies levers for action in addition to the scientific obstacles that require the acquisition of new knowledge.

Incestuous sexual violence against minors (April 2017)

Expert review coordinated by the CNRS at the request of the ministries in charge of children and research.


The question of incestuous sexual violence committed against children is hampered by many taboos and prejudices. As part of the first plan to combat and mobilise against violence against children (2017-2019), this expert review offers an overview of current knowledge from a gender perspective, emphasising a number of analytical prospects: socio-historical analysis of collective representations, reflections on quantification, positive penal law and the study of closed court cases, neuro-developmental and psychological consequences, and psychological support.

It will advance knowledge of the phenomenon from the standpoint of numerical data, overall understanding, and consequences as part of a dynamic perspective of support for public policies. It suggests avenues of thought for research (neuroscience, collective behavioural science, gender and sexuality studies, legal studies, etc.), in addition to raising awareness, training, and care.

The environmental impact of the exploitation of deep-sea mineral resources (June 2014)

Expert review coordinated by the CNRS and Ifremer at the request of the Ministry of Ecology and the Ministry of Research.


Increase in global demand for metals has translated into renewed exploration for mineral resources, including in the deep sea, which represents potentially large metal deposits. The environmental impact for the exploration and exploitation of these mineral resources should be assessed, in addition to their economic consequences. Very little is currently known regarding the ecology of the ecosystems associated with these mineral resources, in addition to their links and interactions with more distant sites. Furthermore, the ecological services provided by these sites or their uses can affect the conditions for their exploitation.

In the framework of the national programme for research and access to deep-sea mineral resources, this expertise provides an exhaustive critical review of scientific findings regarding the environmental consequences of the exploration and exploitation of deep-sea mineral resources. It highlights gaps in knowledge, questions, and uncertainties, and suggests avenues of research to be pursued. Intended for all ocean-related stakeholders, this expert review can illuminate the development of public policies relating to applications for exploratory mining permits. It can also strengthen France’s role in the development of an ambitious marine research and innovation strategy, taking into account environmental requirements and envisioning the conditions for a sustainable exploitation of the deep sea bed.

Herbicide-tolerant plant varieties. Agronomic, environmental, and socioeconomic effects (November 2011)

Expert review coordinated by the CNRS and INRA at the request of the Ministries of Agriculture and Ecology.


Since crop weed control is a decisive factor in yields, selecting plant varieties that can tolerate the application of an existing herbicide substance can offer farmers a technical solution to the difficulties of weed control. Their cultivation is also presented as a means of reducing the quantity of herbicide used. These plant varieties nevertheless raise questions. What are the medium- and long-term effects of their cultivation? What role could they play in policies seeking to reduce the use of pesticides?

This expert review provides the most comprehensive overview possible of knowledge regarding the impact of obtaining and using herbicide-tolerant varieties, via a multidisciplinary approach combining the life sciences, economics, and the social sciences. It highlights the problematics specific to these varieties. One of the review’s results shows that repeated use of these varieties could, under certain conditions, make them ineffective over the medium term. This expert review also emphasises the need for weed control that does not solely rely on varietal innovation, but also includes various complementary approaches.

Photo Credit: © Christian MOREL / LISN / CNRS Image