Windows to the Universe

Factories like this are a major source of air pollution.
Copyright UCAR

Factories like this one make a lot of air pollution.
Copyright UCAR

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Factories like this are a major source of air pollution. Copyright UCAR

Factories like this are a major source of air pollution. Copyright UCAR

Factories like this one make a lot of air pollution. Copyright UCAR

Factories like this are a major source of air pollution.
Copyright UCAR

Factories like this are a major source of air pollution.
Copyright UCAR

Factories like this one make a lot of air pollution.
Copyright UCAR