"Using these devices, he says oil companies can squeeze the longest possible oil exploration season into steadily shrinking winters"
Oil companies now help support a cottage industry of consultants and product manufacturers in Alaska, all providing workarounds for the fact that the frozen ground they rely on to produce oil isn't as frozen as it used to be.
Although Shumaker says when he talks to customers, he doesn't bring up why temperatures are rising.
"To be honest, climate change is pretty good business for our company," says Ed Yarmak, who runs Arctic Foundations and gets about half his work from oil companies on the North Slope. "We're in the business of making things colder."