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International audience ; This paper surveys the use made of modelling expertise in the recent literature focused on the policy making of low-carbon societies in Europe, both peer-reviewed and 'grey'. The first section focuses on the prominent policy instrument of carbon pricing. It starts by analysing the somewhat confusing use made of carbon pricing modelling in policy reports emanating from the French and British governments, then reviews some modelling results on carbon pricing in a 'second best' world. The second section lists the impressive collection of more focused policy instruments that are advocated in both governmental and non-governmental literature. It insists on the contrast between the high degree of precision of some of these policy proposals and the limited modelling of their impacts, either from an environmental or an economic point of view. The third section concludes on recommendations to the policy modelling community inspired by this survey. Purposely avoiding the current controversies surrounding cost–benefit analysis, it advocates further applied research on the cost efficiency of carbon pricing trajectories (when flexibility); on the terra incognita beyond first best uniform pricing (where flexibility); on the elicitation of policy overlaps; and on the modelling of extended policy portfolios in comprehensive, consistent modelling frameworks. © 2014, Springer Science+Business Media Dordrecht.

International audience ; This paper surveys the use made of modelling expertise in the recent literature focused on the policy making of low-carbon societies in Europe, both peer-reviewed and 'grey'. The first section focuses on the prominent policy instrument of carbon pricing. It starts by analysing the somewhat confusing use made of carbon pricing modelling in policy reports emanating from the French and British governments, then reviews some modelling results on carbon pricing in a 'second best' world. The second section lists the impressive collection of more focused policy instruments that are advocated in both governmental and non-governmental literature. It insists on the contrast between the high degree of precision of some of these policy proposals and the limited modelling of their impacts, either from an environmental or an economic point of view. The third section concludes on recommendations to the policy modelling community inspired by this survey. Purposely avoiding the current controversies surrounding cost–benefit analysis, it advocates further applied research on the cost efficiency of carbon pricing trajectories (when flexibility); on the terra incognita beyond first best uniform pricing (where flexibility); on the elicitation of policy overlaps; and on the modelling of extended policy portfolios in comprehensive, consistent modelling frameworks. © 2014, Springer Science+Business Media Dordrecht.

International audience ; This paper surveys the use made of modelling expertise in the recent literature focused on the policy making of low-carbon societies in Europe, both peer-reviewed and 'grey'. The first section focuses on the prominent policy instrument of carbon pricing. It starts by analysing the somewhat confusing use made of carbon pricing modelling in policy reports emanating from the French and British governments, then reviews some modelling results on carbon pricing in a 'second best' world. The second section lists the impressive collection of more focused policy instruments that are advocated in both governmental and non-governmental literature. It insists on the contrast between the high degree of precision of some of these policy proposals and the limited modelling of their impacts, either from an environmental or an economic point of view. The third section concludes on recommendations to the policy modelling community inspired by this survey. Purposely avoiding the current controversies surrounding cost–benefit analysis, it advocates further applied research on the cost efficiency of carbon pricing trajectories (when flexibility); on the terra incognita beyond first best uniform pricing (where flexibility); on the elicitation of policy overlaps; and on the modelling of extended policy portfolios in comprehensive, consistent modelling frameworks. © 2014, Springer Science+Business Media Dordrecht.

International audience ; This paper surveys the use made of modelling expertise in the recent literature focused on the policy making of low-carbon societies in Europe, both peer-reviewed and 'grey'. The first section focuses on the prominent policy instrument of carbon pricing. It starts by analysing the somewhat confusing use made of carbon pricing modelling in policy reports emanating from the French and British governments, then reviews some modelling results on carbon pricing in a 'second best' world. The second section lists the impressive collection of more focused policy instruments that are advocated in both governmental and non-governmental literature. It insists on the contrast between the high degree of precision of some of these policy proposals and the limited modelling of their impacts, either from an environmental or an economic point of view. The third section concludes on recommendations to the policy modelling community inspired by this survey. Purposely avoiding the current controversies surrounding cost–benefit analysis, it advocates further applied research on the cost efficiency of carbon pricing trajectories (when flexibility); on the terra incognita beyond first best uniform pricing (where flexibility); on the elicitation of policy overlaps; and on the modelling of extended policy portfolios in comprehensive, consistent modelling frameworks. © 2014, Springer Science+Business Media Dordrecht.

International audience ; Of all the interconnected threats facing the planet the top two are the climate and biodiversity crises. Neither will be be solved if we ignore the ocean. To turn the tide in favour of humanity and a habitable planet we need to recognise and better value the fundamental role that the ocean plays in the earth system, and prioritize urgent action needed to heal and protect it at the 'Earthscape' level-the planetary scale at which processes to support life operate. The countries gathering at COP26 have unparalleled political capacity and leadership to make this happen. COP26 could be the turning point, where we not only see commitments to united action for the ocean but also plans to meet those commitments based on science-led solutions that address the interconnectivity between the ocean, climate, and biodiversity. Here we first summarise some of the key ways in which the ocean contributes to and has acted as the major buffer of climate change focussing on temperature although not forgetting its role in storing CO2. Noting in particular with 'high confidence' that the ocean has stored 91% of the excess heat from global warming with land, melting ice and the atmosphere only taking up approximately 5%, 3% and 1% respectively (IPCC, 2021). We also highlight the impact of the recent large release of heat from the ocean to the atmosphere during the 2015/16 El Niño. We then present six science-based policy actions that form a recovery-stimulus package for people, climate, nature, and the planet. Our proposals highlight what is needed to view, value, and treat the planet, including the ocean, for the benefit and future of all life.

International audience ; Of all the interconnected threats facing the planet the top two are the climate and biodiversity crises. Neither will be be solved if we ignore the ocean. To turn the tide in favour of humanity and a habitable planet we need to recognise and better value the fundamental role that the ocean plays in the earth system, and prioritize urgent action needed to heal and protect it at the 'Earthscape' level-the planetary scale at which processes to support life operate. The countries gathering at COP26 have unparalleled political capacity and leadership to make this happen. COP26 could be the turning point, where we not only see commitments to united action for the ocean but also plans to meet those commitments based on science-led solutions that address the interconnectivity between the ocean, climate, and biodiversity. Here we first summarise some of the key ways in which the ocean contributes to and has acted as the major buffer of climate change focussing on temperature although not forgetting its role in storing CO2. Noting in particular with 'high confidence' that the ocean has stored 91% of the excess heat from global warming with land, melting ice and the atmosphere only taking up approximately 5%, 3% and 1% respectively (IPCC, 2021). We also highlight the impact of the recent large release of heat from the ocean to the atmosphere during the 2015/16 El Niño. We then present six science-based policy actions that form a recovery-stimulus package for people, climate, nature, and the planet. Our proposals highlight what is needed to view, value, and treat the planet, including the ocean, for the benefit and future of all life.

International audience ; Of all the interconnected threats facing the planet the top two are the climate and biodiversity crises. Neither will be be solved if we ignore the ocean. To turn the tide in favour of humanity and a habitable planet we need to recognise and better value the fundamental role that the ocean plays in the earth system, and prioritize urgent action needed to heal and protect it at the 'Earthscape' level-the planetary scale at which processes to support life operate. The countries gathering at COP26 have unparalleled political capacity and leadership to make this happen. COP26 could be the turning point, where we not only see commitments to united action for the ocean but also plans to meet those commitments based on science-led solutions that address the interconnectivity between the ocean, climate, and biodiversity. Here we first summarise some of the key ways in which the ocean contributes to and has acted as the major buffer of climate change focussing on temperature although not forgetting its role in storing CO2. Noting in particular with 'high confidence' that the ocean has stored 91% of the excess heat from global warming with land, melting ice and the atmosphere only taking up approximately 5%, 3% and 1% respectively (IPCC, 2021). We also highlight the impact of the recent large release of heat from the ocean to the atmosphere during the 2015/16 El Niño. We then present six science-based policy actions that form a recovery-stimulus package for people, climate, nature, and the planet. Our proposals highlight what is needed to view, value, and treat the planet, including the ocean, for the benefit and future of all life.

International audience ; Economic assessments for invasive alien species (IAS) are an urgent requirement for informed decisionmaking, coordinating and motivating the allocation of economic and human resources for the management of IAS. We searched for economic costs of IAS occurring in Spain, by using the InvaCost database and requesting data to regional governments and national authorities, which resulted in over 3,000 cost entries. Considering only robust data (i.e. excluding extrapolated, potential (not-incurred or expected) and low reliability costs), economic costs in Spain were estimated at US$ 261 million (€ 232 million) from 1997 to 2022. There was an increase from US$ 4 million per year before 2000 to US$ 15 million per year in the last years (from € 4 to 13 million). Robust data showed that most reported costs of IAS in Spain (> 90%) corresponded to management costs, while damage costs were only found for 2 out of the 174 species with reported costs. Economic costs relied mostly on regional and interregional administrations that spent 66% of costs in post-invasion management actions, contrary to all international guidelines, which recommend investing more in prevention. Regional administrations unequally reported costs. Moreover, 36% of the invasive species, reported to incur management costs, were not included in national or European regulations (i.e. Black Lists), suggesting the need to review these policies; besides, neighbouring regions seem to manage different groups of species. We suggest the need of a national lead agency to effectively coordinate actions, facilitate communication and collaboration amongst regional governments, national agencies and neighbouring countries. This will motivate the continuity of long-lasting management actions and the increase in efforts to report IAS costs by regional and interregional managers which will adequately provide information for future budgets gaining management effectiveness.

International audience ; Given the current climate and anthropogenic evolution, water management becomes one of the greatest challenges of the 21st century. Number of studies have analyzed observed hydrologic trends and their connections with the changing climate. Impacts include changes in runoff, river discharge and groundwater recharge. Water quality is also impacted, through its many facets including the water temperature. Despite the important progress made in climate modelling, the impact of the predicted global warming on hydrological processes remains uncertain; particularly, in large hydrosystems. The Seine River basin has a surface of 78,650 km², it includes the Seine River and its 50 tributaries, it is populated by 30% of France inhabitants. The Seine River basin crosses 14 departments and 4 regions, including the Paris metropolitan area. Climate change poses a vulnerability due to its potential political, social, and economic consequences in the Seine basin. The agricultural activities and number industries depend on water resources or are located on the river sides. Our ability to adapt water resource management strategies to the climate change depends on our ability to understand and estimate the actual evolution of water resource. The terrestrial water budget is now considered as a single continuum. This integrated conceptualisation needs to simulate the spatial and temporal dynamics of water exchanges between the surface and groundwater. Here we propose to improve the representation of the surface water budget with the goal to decrease the uncertainty of the whole water budget of the Seine hydrosystem. We used the process-based physical land surface model ORCHIDEE (tag 2.2) to estimate surface water budget and heat balance for the period 1980-2018. This application takes advantage of high resolution land-use and albedo maps from ESA-CCI database, and various soil map databases. The model was satisfactorily able to reproduce the discharges of each sub-catchment, the actual evapotranspiration fluxes and LAI. With these results, we are able to estimate the the partitioning of the surface water balance of each catchment of the Seine basin. These results have wide ranging implications such as the estimation of energy balance in the basin, the estimation of spatialisation of the aquifer recharge, and the feedback between aquifers and the surface.

International audience ; Threats to our ocean are climbing both public and political agendas. Marine protected areas (MPAs) are a promising example of Nature-Based Solutions that can protect diversity while delivering ecosystem services when used with a rigorous evidence-based approach, effective management and the right investment. However, insufficient funding for expansion and effective management of MPAs remains a challenge; one that particularly affects developing countries. During the last ten years, a community of investors seeking positive social and environmental returns in addition to financial, have stepped in to fill the marine conservation financing gap. Innovative governance and financial mechanisms must be explored at all levels to provide adequate, flexible and timely funding for MPA operations. Collaborative management partnerships are proven vehicles through which this challenge can be addressed, by creating a more investable ("bankable") structure around MPAs. The main advantages of these partnerships are to improve entrepreneurial approaches to the management of Protected Areas and, for Governments, to reduce the financial burden on Public Budgets. An innovative and scalable collaborative management approach has been recently implemented in the Dominican Republic for the South East Coral Reef Marine Sanctuary. Blended finance solutions have been used to cover the up-front capital needs and MPA revenues are being generated for MPA management and investor returns, via a range of sustainable finance tools including fees paid by visitors and sales of blue carbon credits. Beyond protecting biodiversity, potential benefits include supporting ocean ecosystems, enhanced resilience to climate change, and providing food and income for local communities by supporting sustainable fisheries and tourism. This approach is expected to be transformative for MPAs, and precedent-setting for marine conservation worldwide. After presenting in detail the context of marine impact investment, the enabling conditions ...

International audience ; The vastness of the Pacific Ocean, and the geographic isolation of its island nations, sets the stage for critical disconnects between the drivers and causes of climate change and their local impacts in Pacific Island communities. Pacific Islands, as elsewhere, face persistent local crises at the nexus of natural and human systems that have altered the way we interact with our environments, raising challenging questions about how to sustain the well-being of our communities, and their associated coral reef ecosystems. These ecosystems and communities that rely on them are "canaries in the coal mine" for climate change and biodiversity loss. At the same time, the scientific, technological, indigenous, and social knowledge systems that could contribute to sustainable futures are often siloed in disciplinary as well as political contexts. It is in this arena that the 4-Site Pacific Transect Collaborative seeks to work. The big question we ask is, "What knowledge infrastructure is needed to equitably and democratically support Pacific Islands societies in achieving Sustainable Development Goals and promote the resilience of coral reef social-ecological systems"?

International audience ; Threats to our ocean are climbing both public and political agendas. Marine protected areas (MPAs) are a promising example of Nature-Based Solutions that can protect diversity while delivering ecosystem services when used with a rigorous evidence-based approach, effective management and the right investment. However, insufficient funding for expansion and effective management of MPAs remains a challenge; one that particularly affects developing countries. During the last ten years, a community of investors seeking positive social and environmental returns in addition to financial, have stepped in to fill the marine conservation financing gap. Innovative governance and financial mechanisms must be explored at all levels to provide adequate, flexible and timely funding for MPA operations. Collaborative management partnerships are proven vehicles through which this challenge can be addressed, by creating a more investable ("bankable") structure around MPAs. The main advantages of these partnerships are to improve entrepreneurial approaches to the management of Protected Areas and, for Governments, to reduce the financial burden on Public Budgets. An innovative and scalable collaborative management approach has been recently implemented in the Dominican Republic for the South East Coral Reef Marine Sanctuary. Blended finance solutions have been used to cover the up-front capital needs and MPA revenues are being generated for MPA management and investor returns, via a range of sustainable finance tools including fees paid by visitors and sales of blue carbon credits. Beyond protecting biodiversity, potential benefits include supporting ocean ecosystems, enhanced resilience to climate change, and providing food and income for local communities by supporting sustainable fisheries and tourism. This approach is expected to be transformative for MPAs, and precedent-setting for marine conservation worldwide. After presenting in detail the context of marine impact investment, the enabling conditions ...

International audience ; Given the current climate and anthropogenic evolution, water management becomes one of the greatest challenges of the 21st century. Number of studies have analyzed observed hydrologic trends and their connections with the changing climate. Impacts include changes in runoff, river discharge and groundwater recharge. Water quality is also impacted, through its many facets including the water temperature. Despite the important progress made in climate modelling, the impact of the predicted global warming on hydrological processes remains uncertain; particularly, in large hydrosystems. The Seine River basin has a surface of 78,650 km², it includes the Seine River and its 50 tributaries, it is populated by 30% of France inhabitants. The Seine River basin crosses 14 departments and 4 regions, including the Paris metropolitan area. Climate change poses a vulnerability due to its potential political, social, and economic consequences in the Seine basin. The agricultural activities and number industries depend on water resources or are located on the river sides. Our ability to adapt water resource management strategies to the climate change depends on our ability to understand and estimate the actual evolution of water resource. The terrestrial water budget is now considered as a single continuum. This integrated conceptualisation needs to simulate the spatial and temporal dynamics of water exchanges between the surface and groundwater. Here we propose to improve the representation of the surface water budget with the goal to decrease the uncertainty of the whole water budget of the Seine hydrosystem. We used the process-based physical land surface model ORCHIDEE (tag 2.2) to estimate surface water budget and heat balance for the period 1980-2018. This application takes advantage of high resolution land-use and albedo maps from ESA-CCI database, and various soil map databases. The model was satisfactorily able to reproduce the discharges of each sub-catchment, the actual evapotranspiration ...

National audience ; Par rupture des continuités écologiques, les barrages et autres obstacles présents dans les cours d'eau ou sur leur rive, provoquent une fragmentation des systèmes fluviaux. Cela impose des modifications importantes des régimes hydrologiques, de la température de l'eau et des flux biologiques et biochimiques. C'est le cas de la Sélune, l'un des quatre fleuves côtiers qui termine sa course dans la baie du Mont Saint-Michel en Normandie, en France. Deux grands barrages (Vezins : 36 m et La-Roche-Qui-Boit : 16 m de haut) et de nombreux autres obstacles secondaires entravent les débits d'eau, le transport des sédiments de l'amont vers l'aval, et la migration de plusieurs espèces de poissons diadromes. L'effacement des barrages de la Sélune a fait l'objet de nombreux débats politiques, écologiques et sociétaux initiés dès la décision, par l'Etat, de non-renouvellement des concessions des barrages à EDF en 2009. L'opération d'effacement a été finalement adoptée en 2017 pour débuter en 2019 (Vezins) et s'achever en 2022 (La Roche-Qui-Boit). Après un siècle d'obstruction, les 60 km amont de la rivière Sélune, représentant environ 1000 km d'habitats potentiels, si l'on considère les nombreux affluents de la rivière, seront reconnectés à l'océan.Pour comprendre les mécanismes de restauration du fleuve Selune, un programme scientifique a été lancé en 2012 et se poursuivra jusqu'en 2027. Ce programme unique et multidisciplinaire vise à caractériser les processus physiques, chimiques et biologiques mis en œuvre et d'accompagner les changements sociétaux qui vont s'opérer. Les échelles d'études sont multiples, cascadant du paysage jusqu'aux éléments chimiques. L'objectif de ce programme est de produire un retour d'expérience complet sur la restauration des continuités écologiques des cours d'eau. Un suivi complet implique donc la contribution de nombreuses disciplines et équipes scientifiques, organisées en trois thématiques : la dynamique du territoire, la dynamique fluviale, le fonctionnement des ...