Mass tourism brings dollars but with all the baggage

Last August, the picturesque Himalayan kingdom of Bhutan halved to US$100 per night a charge levied on international tourists. The fee recognized the "important role of the tourism sector in generating employment, earning ...

Chemists tackle formation of natural aerosols

City dwellers have long had to contend with smog—that ugly haze that hangs over urban areas—as a result of emissions-producing human activities as diverse as manufacturing, mowing the lawn, driving cars, and even cooking.

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