Equivalent carbon dioxide COe

In many of the modelling studies of climate change, the situation of doubled pre-industrial atmospheric carbon dioxide has often been introduced as a benchmark especially to assist in comparisons between different model projections and their possible impacts. Since the pre-industrial concentration was about 280 ppm, doubled carbon dioxide is about 560 ppm. From the curves in Figure 6.2 this is likely to occur sometime in the second half of the twenty-first century, depending on the scenario. But other greenhouse gases are also increasing and contributing to the radiative forcing. To achieve an overall picture, it is convenient to convert other greenhouse gases to equivalent amounts of carbon dioxide, in other words to amounts of carbon dioxide that would

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