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Published online by Cambridge University Press: 13 July 2009
The increase of the emission of carbon dioxide and other greenhouse gases since the beginning of the industrial era, and the climatic change that it may trigger, are not subjects of public awareness, even though the evidence that the change has already been observed is still debated. The intensive research carried out in the last few decades to reduce the uncertainty in prediction has led to better identification of the other mechanisms able to influence the climate. The purpose of this paper is to present, in a simplified manner, these other sources of climate forcing, which may be responsible for a climatic variability superimposed on the long term one caused by the increase of the greenhouse gases and which may hide and even counteract its effects.