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fossil-fuel × 18climate-change × 4
geology × 3
petroleum × 3
gas × 2
identification-request × 1
oceanography × 1
geochemistry × 1
mineralogy × 1
weather-forecasting × 1
sedimentology × 1
atmospheric-chemistry × 1
fossils × 1
carbon-cycle × 1
geothermal-heat × 1
environmental-protection × 1
crust × 1
pollution × 1
ozone × 1
thermodynamics × 1
igneous × 1
carbon × 1
economic-geology × 1
forest × 1
time × 1
