NPR suggests that if ice prevents musk ox from feeding, it's your cell phone charger's fault

When Rain Falls On Snow, Arctic Animals May Starve : NPR

When wildlife biologists visited a remote spot in Canada called Banks Island in the spring of 2004, they discovered thousands upon thousands of dead musk oxen. It took years to determine the cause. They called it "rain-on-snow" — the worst case of it ever documented.
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What happens is this: Unusually warm weather drops rain on top of snowpack. The rain either pools at the surface or trickles down to the soil below the snowpack, then freezes into a sheet of ice. Musk oxen, which are shaggy, cow-sized animals that weigh hundreds of pounds, can't break through the ice to browse on plants underneath the snow. Sooner or later, they starve.
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"If the climate warms up, it doesn't just grow palm trees in sunny Fairbanks, Alaska," says Tom Grenfell, an atmospheric scientist at the University of Washington. "It creates more storms and mixes the atmosphere up a lot more." That could mean more rain-on-snow events, he says.
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But so far no one knows whether these events are increasing — no one has ever checked. That's what Putkonen and Grenfell are planning to do next. They've figured out what rain-on-snow looks like on a satellite image.