two thirds of the snow here is "artificial snow," as it's called in the industry, by people like peter nÄfking artificial snow requires 6 to 8 people working around the clock. well, some will be sleeping or off duty. but the other 3 to 4 will be out on the slope, working. >> it's a high-tech endeavor. the snow groomers are equipped with a special gps system to measure the snow cover on the slope. >> in the past, without gps, this wasn't possible. we often produced more snow that piled up in one area or another, even though it wasn't needed the entire season. now we can produce 30% less artificial snow. >> there are 320 snow cannons in switzerland's jungfrau region. they're connected via an underground system of water pipes. it was a major investment, that cost ove38 million euros. the water comes from reservoirs, and the electricity from hydro power. it's a huge undertaking but it pays off for the industry. in the swiss alps, one in 4 jobs relies on winter tourism. and industry experts say vacationers are more demanding nowadays. >> guests expect there to be snow. they expect all the slope

two thirds of the snow here is "artificial snow," as it's called in the industry, by people like peter nÄfking artificial snow requires 6 to 8 people working around the clock. well, some will be sleeping or off duty. but the other 3 to 4 will be out on the slope, working. >> it's a high-tech endeavor. the snow groomers are equipped with a special gps system to measure the snow cover on the slope. >> in the past, without gps, this wasn't possible. we often produced more snow that piled up in one area or another, even though it wasn't needed the entire season. now we can produce 30% less artificial snow. >> there are 320 snow cannons in switzerland's jungfrau region. they're connected via an underground system of water pipes. it was a major investment, that cost ove38 million euros. the water comes from reservoirs, and the electricity from hydro power. it's a huge undertaking but it pays off for the industry. in the swiss alps, one in 4 jobs relies on winter tourism. and industry experts say vacationers are more demanding nowadays. >> guests expect there to be snow. they expect all the slope