WHISTLER, B.C.—The Whistler-Blackcomb ski area will soon begin to make snow to augment its shrinking Horstman Glacier.

    The glacier serves as just one of two places in North America where commercial summer skiing operations are conducted. In most recent years—but not the last two years—snowfall on the glacier has actually increased. But winter gains have been quickly lost to summer’s sizzling temperatures.

    Arthur De Jong, the mountain planning and environmental resources manager at Whistler-Blackcomb, says studies that began in the 1970s show that winter-time temperatures have increased 0.5 degrees Centigrade, but those in summer have increased 2 degrees C.

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