Carbon FootprintGreenhouse EffectOxidation-ReductionAir PollutionClimate ChangeConservation of Natural ResourcesCarbon DioxideTime FactorsKineticsPositron-Emission TomographyOtoacoustic Emissions, SpontaneousTomography, Emission-ComputedVehicle EmissionsFluorodeoxyglucose F18RadiopharmaceuticalsTomography, Emission-Computed, Single-PhotonFluorine RadioisotopesSpectrometry, FluorescenceAir PollutantsMethaneMultimodal ImagingAtmosphereTomography, X-Ray ComputedVolatilizationPentanesCarbon RadioisotopesEnvironmental MonitoringBrainGasolineFossil FuelsFluorescent DyesFluorescencePower PlantsVolatile Organic CompoundsCoalSpectrometry, X-Ray EmissionDenitrificationLuminescenceNitrous OxideCerebrovascular CirculationLuminescent MeasurementsSensitivity and SpecificityManureMagnetic Resonance ImagingOrganotechnetium CompoundsCochleaGasesEnergy-Generating ResourcesConservation of Energy ResourcesImage Processing, Computer-AssistedPhotonsNitrogen RadioisotopesThallium RadioisotopesIncinerationRadioactive TracersRacloprideCopper RadioisotopesParticulate MatterDeoxyglucoseTechnetium Tc 99m ExametazimeHemiterpenesOximesModels, TheoreticalGas, NaturalGlobal WarmingTechnetium Tc 99m SestamibiCarbonRadioisotopesDiagnostic ImagingEar CanalAmmoniaReproducibility of ResultsSoilAcoustic Impedance TestsFertilizersHydrocarbons