Data on the pace and global distribution of sea level rise, for example, remains incomplete and uncertain. So does information about the energy exchange between oceans and atmosphere in the global ocean conveyor belt; the global rate of biodiversity loss; actual melt of ice sheets in Antarctica, the Arctic, and Greenland; cloud dynamics and local shifts in rainfall as a result of global changes in weather patterns; and the importance of air pollution for the global climate. To put it simply, we need to measure, measure, measure, not to get certainty, but to understand risk and become cleverer
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