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w 20 | Focus cnrs I international magazine 02 The IPCC of the IPSL,2 a federation of French laboratories specialized in environmental research. “In fact, the discussion on climate change is well and truly open, especially on the extent of the phenomenon, the strategies for adapting to it, and the means to combat it.” In addition, despite a painstaking review process (see next page), an error cannot be ruled out. For example, the fourth report (2007) stated that Himalayan glaciers were melting faster than they actually are. Strong political commitments needed Nevertheless, the IPCC’s paramount objective is to “provide an indisputable—i.e., unanimously approved—reference document used by governments for international negotiations on climate issues,” says Nicolas Bériot, secretary general of the ONERC,3 the organization in charge of the French government’s delegation to the IPCC. Following the Warsaw (Poland) round of negotiations last November, governments will meet again in Peru (2014) and France (2015). According to Le Treut, “that’s where the scientists’ role ends. We can and must sound the alarm, but we cannot be the proponents of any specific measures.” All the more so as fighting climate change is a dauntingly complex task. It must integrate what science tells us about the physical modifications of our planet and their impact on its flora and fauna—and therefore on humans and their means of subsistence. It must also take into account the economic and social realities of individual countries. “Consider greenhouse gas reduction measures,” Le Treut says, “there is now a broad consensus on the need for strong commitments, but no ‘on/off button’ to make it happen. It is a matter of political will and of integrating complex measures into economies or social systems that could very well end up rejecting them.” 01. L aboratoire des sciences du climat et de l’environnement (CNRS / CEA / UVSQ). 02. The Institut Pierre-Simon Laplace comprises six laboratories under ten supervisory institutions: CNRS / UPMC / UVSQ / CNES / CEA / IRD / ENS / École Polytechnique / Université Paris-Diderot / UPEC. 03. O bservatoire national sur les effets du réchauffement climatique. © unfccc Governments and organizations appoint The bureaus select the authors experts > 02 Discussions and negotiations on climate change at an IPC meeting in Doha in 2012. genesis of a report © source : IPCC 2013, infographie : CNRS . photo : jd-photodesign/fotolia Contact information: Nicolas Bériot > nicolas.beriot@developpement-durable.gouv.fr Jean Jouzel > jean.jouzel@lsce.ipsl.fr Hervé Le Treut > letreut@lmd.jussieu.fr Rajendra Pachauri > ipcc-sec@wmo.int online. The IPCC’s official website > www.ipcc.ch The IPCC approves the outline Scoping meeting to prepare the outline The authors prepare a first-order draft of the report, based on the scientific literature Expert review


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