Carbon FootprintGreenhouse EffectWaste ManagementGasesMethaneConservation of Natural ResourcesEnergy-Generating ResourcesPositron-Emission TomographyOtoacoustic Emissions, SpontaneousGas, NaturalFertilizersTomography, Emission-ComputedAir PollutantsAgricultureNitrous OxideAir PollutionVehicle EmissionsCarbon DioxideFluorodeoxyglucose F18RadiopharmaceuticalsTomography, Emission-Computed, Single-PhotonEnvironmental MonitoringCarbonSoilAnimal HusbandryFluorine RadioisotopesSpectrometry, Fluorescence