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Skiers descend a slope in front of a snow cannon, on December 12, 2012, in Val d'Isere, French Alps. Recent snowfalls have encouraged skiers to hit the slopes and the Val d'Isere authorities have opened certain slopes early.  AFP PHOTO/PHILIPPE DESMAZES        (Photo credit should read PHILIPPE DESMAZES/AFP/Getty Images)
Skiers descend a slope in front of a snow cannon, on December 12, 2012, in Val d'Isere, French Alps. Recent snowfalls have encouraged skiers to hit the slopes and the Val d'Isere authorities have opened certain slopes early.  AFP PHOTO/PHILIPPE DESMAZES        (Photo credit should read PHILIPPE DESMAZES/AFP/Getty Images)

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How ski resorts combat climate change

The French resort of Val d'Isère has invested in the largest snow-making facility in Europe to make sure the Ski World Cup races can go ahead.

How ski resorts combat climate change

The French resort of Val d'Isère has invested in the largest snow-making facility in Europe to make sure the Ski World Cup races can go ahead.