When burned to produce energy, natural gas produces much less carbon - roughly half of what the burning of the dirtiest coal produces. The fracking of natural gas has brought down America's CO2 emissions.
"How much carbon dioxide is produced when different fuels are burned?
"Different fuels emit different amounts of carbon dioxide (CO2) in relation to the energy they produce when burned. To analyze emissions across fuels, compare the amount of CO2 emitted per unit of energy output or heat content.
"Pounds of CO2 emitted per million British thermal units (Btu) of energy for various fuels:
| Coal (anthracite) | 228.6 |
| Coal (bituminous) | 205.7 |
| Coal (lignite) | 215.4 |
| Coal (subbituminous) | 214.3 |
| Diesel fuel and heating oil | 161.3 |
| Gasoline (without ethanol) | 157.2 |
| Propane | 139.0 |
| Natural gas | 117.0 (taken from U.S. Energy Information Administration) |
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