Marcel Leroux is a French climatologist, a former Professor of Climatology at Jean Moulin University in France, and director of the Laboratory of Climatology, Risk, and Environment. Marcel Leroux argues on his book "Global Warming: Myth or Reality? The Erring Ways of Climatology" that the case for global warming is based on models which, with their insufficiencies in the understanding and explanation of weather phenomena, are not reliable to support this prediction: "So we do not have to resort to complicated models to tell us that CO2 brings about, theoretically, an increase in temperature... . However, this hypothesis has never been demonstrated as far as climate is concerned, and remains in the realm of the virtual." He also poses the question if warming may be considered a benefit in some regions. On the causes of climate change, he writes in a section entitled "Conclusion: The greenhouse effect is not the cause of climate change": "The possible causes, then, of climate change are: well-established orbital parameters on the palaeoclimatic scale, with climatic consequences slowed by the inertial effect of glacial accumulations; solar activity, thought by some to be responsible for half of the 0.6°C rise in temperature, and by others to be responsible for all of it, which situation certainly calls for further analysis; volcanism and its associated aerosols (and especially sulphates), whose (short-term) effects are indubitable; and far at the rear, the greenhouse effect, and in particular that caused by water vapor, the extent of its influence being unknown. These factors are working together all the time, and it seems difficult to unravel the relative importance of their respective influences upon climatic evolution. Equally, it is tendentious to highlight the anthropic factor, which is, clearly, the least credible among all those previously mentioned." (Leroux 2005, p. 120)
References
Leroux, Marcel (2002-01-01). The Meteorology and Climate of Tropical Africa (Hardcover), Springer Praxis, 548. ISBN 3540426361. Comby, Jacques; Marcel Leroux (2005-08-30). Global Warming - Myth Or Reality? (Hardcover), Springer Praxis, 510. ISBN 354023909X.
