ANNEX
Carbon Dioxide inventory and projections
Emissions of carbon dioxide were calculated
using an econometric model linked to a model of the electricity
supply industry. The equations were fitted to historical data
on fuel demand, fuel price and economic activity for activities
in six main sectors of the economy. The model was then used to
project fuel demand, and hence carbon dioxide emissions, using
assumptions about future fuel price and economic output agreed
interdepartmentally. The model projections are described in Energy
paper 65.
Methane inventory and projection assumptions
|
| Source category | Inventory methodology
| Basis for projections |
|
| Fuel combustion | Emission factors based on carbon content of fuels, national energy statistics
| Projected national energy use |
| | |
| Oil and gas production | Emission factors by installation type, reporting of gas flared, census of installations, national oil and gas production data
| Changing number of installations, projected energy use
|
| | |
| Coal mining | Emission factors from measurements at UK mines, annual coal production data
| Projected national energy statistics |
| | |
| Natural gas distribution | Comprehensive leakage measurements on national distribution network
| Changing network characteristics and leakage abatement
|
| | |
| Agriculture: livestock | Emission factors for representative animal types; annual animal census
| Estimated animal populations, likely changes in emission factors
|
| | |
| Agriculture: livestock wastes | Emission factors and waste arisings by animal type; national animal census
| Estimated animal populations |
| | |
| Landfills | First order decay model calibrated to UK measured data, national data on waste characteristics and energy recovery from landfill
| UK waste strategy targets, population, trends in landfill site design and energy recovery schemes
|
| | |
| Sewage treatment and disposal | Emission factors for specific treatment and disposal routes, national data on sludge production
| Population, estimated likely changes in disposal routes
|
|
Nitrous oxide inventory and projection assumptions
|
| Source category | Inventory methodology
| Basis for projections |
|
| Industry | Emission factor calculated from an assessment of chemistry involved, annual production statistics
| Estimated production data, EPA/IPC regulations
|
| | |
| Agriculture: fertiliser use | Emission factors for representative UK fertiliser types, Survey of Fertiliser Practice
| Estimated national fertiliser use |
| | |
| Agriculture: livestock wastes | Emission factors and waste arisings by animal type; national animal census
| Estimated animal populations |
| | |
| Agriculture: biological nitrogen fixation |
Basic Horticultural Statistics, emission factors for representative UK crops
| Estimated crop areas |
| | |
| Transport | Emission factors for general types of vehicles, national transport statistics
| Estimated vehicle fleet composition, projected national energy statistics
|
| | |
| Energy and Transformation Industries | National energy statistics
| Projected energy use statistics |
|
HFC, PFC and SF6 inventory and projection assumptions
|
| Source category | Inventory methodology
| Basis for projections |
|
| PFCs: Aluminium industry | Emission factors relevant to UK industry, number and duration of "anode effects"
| Projected number and duration of "anode effects"
|
| | |
| PFCs: other uses | Consumption statistics by sector, time resolved emission model
| Use predictions by sector, likely future emission rates
|
| | |
| HFCs: manufacture of HCFC-22 | Emission factor calculated from an assessment of chemistry involved, annual production statistics
| Estimated production data, EPA/IPC regulations
|
| | |
| HFCs: other uses | Consumption statistics by sector, time resolved emission model
| Use predictions by sector, likely future emission rates
|
| | |
| SF6: magnesium foundries | Emission factor based on technology used, production data
| Estimated production levels |
|
|
