John Ord of Susquehanna, Pa., loads 40-pound bags of anthracite coal into his car. He’s among the fewer than 130,000 households left in the United States that burn coal to heat their homes.

John Ord of Susquehanna, Pa., loads 40-pound bags of anthracite coal into his car. He's among the fewer than 130,000 households left in the United States that burn coal to heat their homes.

John Ord of Susquehanna, Pa., loads 40-pound bags of anthracite coal into his car. He’s among the fewer than 130,000 households left in the United States that burn coal to heat their homes.

John Ord of Susquehanna, Pa., loads 40-pound bags of anthracite coal into his car. He’s among the fewer than 130,000 households left in the United States that burn coal to heat their homes