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From a mound of trash on the banks of the Buriganga River, a nine-year-old girl collects pieces of metal to sell.

The Last Pixel

A United Front

Photograph by Shehzad Noorani

From a mound of trash on the banks of the Buriganga River, a nine-year-old girl collects pieces of metal to sell. The best hopes for solving the world’s environmental threats to health—from pollution-choked rivers in Bangladesh to asthma-inducing air in Baltimore—can be found at the convergence of two fields: public health and engineering.

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