City dwellers have smaller footprints

A report from the International Institute for Environment and Development released last week indicates that city dwellers emit an average of two thirds of the emissions of those who live in cities. Larger cities and their transport networks tend to be more efficient but the details depend on a large number of factors. Residents of Rio di Janiero, for example, emit about one third of the national greenhouse gases average per person. The report notes that by 2050 more than half the world’s populations will live in cities and concludes that making those cities as sustainable as possible will be one of the key factors in reducing greenhouse emissions.

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