More than just hot air?
D000329:Advertising; D002244:Carbon / Q000737:chemistry / Q000302:isolation & purification; D002245:Carbon Dioxide / Q000737:chemistry / Q000302:isolation & purification; D003246:Conservation of Energy Resources / Q000191:economics* / Q000639:trends*; D004736:Energy-Generating Resources / Q000191:economics; D005579:Fossil Fuels; D006859:Hydrogen / Q000737:chemistry; D014481:United States
D005579:Fossil Fuels; D002245:Carbon Dioxide; D002244:Carbon; D006859:Hydrogen