Improving air quality means confronting powerful interest groups in the coal (shown above) and oil industries. These groups can resist change. (Photo: Rodrigo)

Improving air quality means confronting powerful interest groups in the coal (shown above) and oil industries. These groups can resist change. (Photo: Rodrigo)

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Improving air quality means confronting powerful interest groups in the coal (shown above) and oil industries. These groups can resist change. (Photo: Rodrigo)

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