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Agir pour le climat : arènes, enjeux, pouvoirs - dossier, Revue internationale et stratégique, n° 109, 2018/1 https://www.cairn.info/revue-internationale-et-strategique-2018-1.htmSommaire du dossier : Les lendemains de l’Accord de Paris : l’avenir de la planète se joue-t-il hors des COP ? / Entretien avec Pascal Canfin, Du paria au leader, du leader au paria : les trajectoires croisées de la Chine et des États-Unis dans les négociations climatiques / François Gemenne Les acteurs de la défense face au changement climatique : itinéraire d’une nouvelle contrainte stratégique en France et aux États-Unis / Bastien Alex Le changement climatique en débat au Conseil de sécurité de l’ONU / Lucile Maertens L’odeur de l’argent : les fondations philanthropiques dans le débat climatique international / Edouard Morena Les symptômes méconnus du climat : un défi sanitaire mondial / Anne Sénéquier Les ONG, des outsiders centraux des négociations climatiques ? / Sylvie Ollitrault « La décentralisation de la politique énergétique doit devenir une réalité pour lutter contre le changement climatique » / Entretien avec Claire Roumet L’ouverture des arènes climatiques internationales aux organisations autochtones, nouvelle opportunité pour la défense des droits territoriaux / Émilie Dupuits La montée en puissance de l’expertise climatique du Sud / Entretien avec Saleemul Huq De la vulnérabilité au weak power : le Bangladesh face au changement climatique / Alice Baillat From “Spoiler” to “Bridging Nation”: The Reshaping of India’s Climate Diplomacy / Dhanasree Jayaram Effondrement, adaptation ou prospérité à l’heure du changement climatique / Emmanuel HacheSystems Innovation, Inertia and Pliability:  A mathematical exploration with implications for climate change abatement / Michael Grubb, Jean-Francois Mercure, Pablo Salas, Rutger-Jan Lange, Ida Sognnaes. Energy Policy Research Group, March 2018, 62 p. (EPRG workin paper ; 1808) https://www.eprg.group.cam.ac.uk/eprg-working-paper-1808/This paper develops a stylised mathematical interpretation of innovation and inertia in economic systems, characteristics which feature in economics literature traceable back at least to Schumpeter and other economic theorists of innovation, as well as economic historians. Such characteristics are particularly important in energy systems and their potential response to climate change, where it is important to distinguish operational/fuel substitution from investment because the latter necessarily embodies both in ertia and innovation, in systems as well as technologi es.We argue that integrated assessments of climate abatement need to focus on investment, including the associated characteristics of both learning and inertia, and derive in detail the mathematical basis for incorporating these factors through marginal investment cost curves. From this we also introduce the concept of ‘pliability’ as an expression of the ratio between costs which are significant but transitional (including learning investments, infrastructure and overcoming inertia), as compared to the enduring costs implied by purely exogenous technology assumptions.We then incorporate these features in a global model of optimal climate mitigation and show that they can generate a very different profile and pattern of results from traditional ‘integrated assessment’ models, pinpointing the key sensitivities. We conclude that alongside all the attention devoted to evaluating climate change impacts and technology scenarios, far more effort should be devoted to understanding the structural characteristics of how the global energy system may respond to climate change mitigation.