Johannesburg limits water use as drought worsens

Johannesburg, South Africa's largest city and economic hub, on Monday imposed emergency water restrictions as supplies deteriorated due to a drought, the worst to ravage the country in three decades.

CMU researcher studies variation in pollutant emissions

Cities are known to wear an unfortunate toupee of air pollution. Even with EPA standards and the development of green infrastructure, pollutant emissions are much higher in populous cities than in the sprawling countryside. ...

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