The emission rate of carbon dioxide (CO2) is one of the less obviousbut nevertheless significantmeasures of volcanic activity. Volcanic CO2 emissions are also important for understanding the preindustrial climate balance. To date, estimates of global volcanic CO2 emissions have been extrapolated primarily from measurements collected at a small number of active sources. Ice-covered volcanic centers are prevalent, but they are often difficult to access, and their vents are difficult to discern, so they are rarely included in these calculations.
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