Environment: Rescuing Swiss Lakes

Switzerland's travel posters and brochures still stress the majestic mountains and many lakes that over the years have lured millions of summer tourists to the tiny nation. Recently, however, there has been a subtle change in what the tourist literature portrays. While the brochures still contain scenes of happy vacationers strolling near or boating on lakes, some of them no longer show swimmers in the water. Reason: some of the most famous Swiss lakes are now badly polluted.

The once bright waters of Lake Lugano, for example, have been contaminated by the daily dumping of untreated human wastes by communities along both...

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