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Aerosols

Global Dimming? Assombrissement global?

18 Jan 2005 by Gavin

It just so happens that most of the posts on this site have tried to counteract arguments from those who would sow fake “uncertainty” in the climate debate. But lest our readers feel that we are unjustifiably certain about our knowledge, let us look at a recent example of the opposite tendency: too much certainty.

A recent BBC Horizon documentary (transcript) raised the issue of ‘global dimming’ and argued that this ‘killer’ phenomena’s newly-recognised existence would lead to huge re-assessments of future global warming. As part of the hyperbole, the process of global dimming was linked very clearly to the famines in Ethiopia in the 1980s and the implication was left that worse was to come. Media reports with headlines like “Fossil Fuel Curbs May Speed Global Warming” swiftly followed. So what’s the real story?
par Gavin Schmidt (traduit par Pierre Allemand)
Il est un fait que la plupart des interventions sur ce site ont essayé de contrer les arguments de ceux qui voudraient semer une “incertitude” trompeuse dans le débat sur le climat. Mais, de peur que nos lecteurs pensent que nous sommes abusivement certains de nos connaissances, examinons un exemple récent de la tendance inverse : trop de certitude.

Un récent documentaire de la série “Horizon” de la BBC (transcription) a soulevé la question d’un “assombrissement global” et a indiqué que l’existence récemment reconnue d’un tel phénomène « tueur » pourrait amener à reconsidérer très fortement l’hypothèse d’un futur réchauffement global. Cet audacieux raisonnement faisait un lien très clair entre l’assombrissement global et les famines en Ethiopie durant les années 1980, le plus grave restant encore à venir. Des dépêches de presse avec des titres du genre « Le coup de frein sur les énergies fossiles pourrait accélérer le réchauffement global » suivaient dans la foulée. Mais, qu’en est-il exactement ?
(suite…)

[Read more…] about Global Dimming? Assombrissement global?

Filed Under: Aerosols, Climate Science, Greenhouse gases

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