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Blowing Hot and Cold

A. Climate change may be slow and uncertain, but that is no excuse for inaction. One reason why uncertainty over climate change looks to be with us for a long time is that the oceans, which absorb carbon from the atmosphere, act as a time-delay mechanism. Their massive thermal inertia means that the climate system responds only very slowly to changes in the composition of the atmosphere. Another complication arises from the relationship between carbon dioxide (CO2), the principal greenhouse gas (GHG), and sulphur dioxide (SO2), and a common pollutant. Efforts to reduce man-made emissions of GHGs by cutting down on fossil-fuel use will reduce emissions of both the gases. The reduction in CO2 will cut warming, but the concurrent SO2 cut may mask that effect by contributing to the warming.
B. There are so many such fuzzy factors—ranging from aerosol particles to clouds

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