shale | 0.34 |
coal beds | 0.34 |
gaseous state | 0.32 |
reservoir | 0.30 |
generate electricity | 0.73 |
replace coal | 0.70 |
produce heat | 0.61 |
surpass coal | 0.57 |
produce carbon dioxide | 0.56 |
dissipate into the atmo… | 0.54 |
become cheap | 0.48 |
replace oil | 0.47 |
displace coal | 0.47 |
occur in nature | 0.46 |
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physical change | 0.35 |
explosion | 0.34 |
fire | 0.30 |
little processing | 0.16 |
asphyxiation | 0.32 |
shortage | 0.25 |
a fossil fuel | 0.71 |
fuel | 0.65 |
a greenhouse gas | 0.61 |
gas | 0.57 |
a bridge fuel | 0.53 |
the cleanest burning fo… | 0.48 |
clean fuel | 0.43 |
powerful greenhouse gas | 0.42 |
finite resource | 0.42 |
primary fuel | 0.40 |
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the solution | 0.43 |
composed of methane | 0.74 |
extracted | 0.72 |
transported by pipeline | 0.72 |
burned | 0.72 |
used in the united stat… | 0.71 |
used to generate electr… | 0.71 |
produced | 0.71 |
consumed in the united … | 0.71 |
produced in the u.s. | 0.68 |
used to heat home | 0.66 |
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