Societies measure what they care about. Measurement helps decision-makers and the public define social goals, link them to clear objectives and targets, and assess progress toward meeting those targets. It provides an empirical and numerical basis for evaluating performance, for calculating the impact of our activities on the environment and society, and for connecting past and present activities to attain future goals. Measuring sustainable development—just as we currently measure economic production—makes it possible for social and environmental goals to become part of mainstream political and economic discourse.

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