R2DS Île-de-France

Réseau de Recherche sur le Développement Soutenable

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Fevrier 2015

Jeudi 22 Janvier

Paris Environmental and Energy Economics Seminar

Résumé

The two speakers are Stefan Behringer (University of Duisburg-Essen) and Harold Levrel (AgroParisTech, Cired)

Stefan Behringer (University of Duisburg-Essen)

joint with Thorsten Upmann

"Optimal Harvesting of a Spatial Renewable Resource"

Abstract :

In this paper we investigate the optimal harvesting of a renewable natural resource. While in most standard approaches the resource is located at a single point, we allow the resource to be distributed spatially. Consequently, an agent who exploits the resource has to travel from one location to another. For a fixed planning horizon, we investigate the speed and the path of harvesting chosen by the agent. We show that the agent adjusts this speed so as to visit each location only once, even in the absence of travelling cost. Since the agent does not return to any location for a second harvest, it is optimal to fully deplete the resource upon arrival. A similar type of bang-bang solution results when we drop the assumption of a constant harvesting rate : allowing for a variable harvesting rate, the agent chooses to fully exploit the resource either in the last or in the first travelling period. A society interested in conserving some of the resource thus has to take measures to limit the exploitative behaviour of the agent.

Harold Levrel (AgroParisTech, Cired)

joint with Pierre Scemama

"Using habitat equivalency analysis to balance the cost-effectiveness of restoration outcomes in four institutional contexts"

Abstract :

One of the Aichi Biodiversity Targets adopted in 2010 in Nagoya, during the tenth meeting of the Conference of the Parties, is to restore at least 15 per cent of degraded ecosystems (target 15) by 2020.
At the national scale, with a given amount of resource available for financing public investment in the restoration of biodiversity, it is difficult to priorizing alternative restoration projects. One way to do it is to assess the level of ecosystem services delivered by these projects and to compare them with their costs. The challenge is to be able to propose a common unit of ecosystem services in order to compare between them these projects, carried out in different institutional contexts (application of environmental laws, management of naturel reserve, production of specifics services for local population, etc.). The aim of this paper is to assess how it is possible to use the Habitat Equivalency Analysis (HEA) as a tool to evaluate ecosystem services provided by various restoration projects developed in different institutional contexts. This tool was initially developed to quantify the level of ecosystem services required to compensate non-market impacts coming from accidental pollution in US. In this paper, HEA is used to assess cost-effectiveness of various restoration projects with regard to different environmental policies, using some case studies based in France. This work was conducted on four different case studies : (1) the creation of a market for wetlands both as mitigation credits and lagoon systems for filtration, (2) the public acceptance of a project of port development, (3) the rehabilitation of marshes to mitigate nitrates loadings to the sea and (4) the restoration of streams in a protected area.

Our main conclusion is that HEA can provide a simple tool to clarify the objectives of restoration projects, help to make a link between costs and effectiveness of these projects and then to carry out trade off, without requiring an important amount of human or technical means.

Jeudi 12 fevrier de 16h30 à 18h30

Maison des Sciences Economiques
106-112 boulevard de l’Hôpital
75013 Paris.

Pour télécharger le programme cliquez ici


Jeudi 12 janvier

La transition énergétique en France et en Allemagne : déconstruire les idées reçues

Résumé

Une intervention d’Andreas Rüdinger dans le cadre d’une conférence organisée à l’Assemblée nationale.

Présentation :

« Comment le couple franco-allemand entend-il la transition énergétique, cette transformation sociétale majeure ? La Fondation Jean-Jaurès, la Fondation Friedrich-Ebert et Europartenaires organisent une conférence-débat pour déconstruire les idées reçues de part et d’autre du Rhin. »

En raison du renforcement des procédures de sécurité, l’inscription est obligatoire avant le lundi 09 février 2015 à 12 h. Les personnes non inscrites ne pourront pas être admises dans la salle.

Inscription sur le site de la conférence

Jeudi 12 fevrier, de 17h00 à 20h30

Assemblée Nationale