For decades, coal has been at the center of Hopi life, literally. In the middle of each home is a coal-burning stove that keeps families warm through the winter.
"A lot of people relied on the coal to heat their homes and ceremonial chambers, the kivas," says Leigh Wayne Lomayestewa, who works in the tribe's cultural preservation office. "And now we're only relying on the cedar wood."
But he says cedar doesn't burn as long as coal.
"Usually at nighttime, you can put in about two or three times a night," Lomayestewa says.