Some scientists say the Chacaltaya glacier in Bolivia, which used to be the world's highest ski run, has already nearly disappeared.
And Miller believes it could even mean the difference between life and death at the end of a long ski run.
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La Repubblica newspaper reports that the search operation was made more complex by the fact that the victims ended up in a rocky and densely forested area beyond the ski run.
Plus there is a ski run that runs right down to Main Street, serviced by the Town Lift, which carries you back up to the slopes of Park City Mountain Resort.
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Often when ski resorts do run tempting special offers, they are blacked out at the busiest times: weekends, school vacations, and peak holiday weeks such as Christmas-New Years.
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Specialized prostheses (replacements) and orthoses (braces) for competitive disabled athletes who run, ski, and cycle can be more complex.
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"This is the best glade skiing anywhere east of the Rockies, " says Steven Rowe, a former emergency room doctor who gave up medicine to run the ski patrol at Bohemia in the winter and cut new trails in the summer.
Petitt flew into Denver and had a look at the site, a run-down ski resort then called Squaw Pass that hadn't operated since 1974.
The video below is of me on the top section of the run at the nearby Darlux ski area, which is narrower, faster, and entirely more difficult to navigate at speed.
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We started by practicing to ski in each voice doing a run as if one feeling ruled our world.
Mr. Holding and his wife were known to bus tables at their ski resorts, and their children helped to run their hotels.
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And be reminded that even the people who run the world, when seen in ski clothes struggling for footing on a slippery sidewalk or sweating like veal calfs in an overcrowded conference hall, are pretty much like the rest of us: affable, irritable, hungry for human contact.
Cook had run a chemical company and the Sugar Loaf ski station in Maine.
"When times are bad, that's the very worst time to cut and run, " says Arntzen, 51, an athletic Norwegian-American who has run seven marathons and competes in 90-kilometer ski races.
Its owner and founder, Patrick Cunningham, an entrepreneur with a winter ski rental business, helped establish the now-popular river outings run by a dozen companies from spring through fall.
We're out of the helicopter, staring down the Big One, a 4, 500-foot run down a massive glacier by far the longest ski path I've ever seen.
Run by the Club Andino de Chile, a mountain recreation and ski club, this is the only non-commercial resort close to the capital.
In towns across the Alps you can rent a sled, take a train or ski lift a mile or two up the hill, and launch yourself on a terrifying run that puts the rides at Disney World to shame.
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