Activity data
Activity data, according to the Revised 1996 IPCC Guidelines for National Greenhouse Gas Inventories, are defined as data on the magnitude of human activity resulting in emissions or removals taking place during a given period of time.

Emission categories
Emission estimates are presented in accordance with the categories of the Intergovernmental Panel on Climate Change Guidelines for National Greenhouse Gas Inventories (1996).
The category "National Total" does not include emissions resulting from fuel sold for use in ships or aircraft engaged in international transport (international bunker fuel emissions).

Emission factors
An emission factor is defined as the average emission rate of a given GHG for a given source, relative to units of activity.

Global Warming Potentials
The Global Warming Potentials (GWP) used for presentation of CH₄ and N₂O in terms of CO₂ equivalent are 21 and 310, respectively. For HFCs, PFCs, and SF₆ the GWP values for a 100 year time horizon have been used. (source of GWP: Climate Change 1995: The Science of Climate Change, table 4, p. 22, Intergovernmental Panel on Climate Change, 1996).

Gross domestic product
According to the World Bank, gross domestic product (GDP) is defined as the measure of the total output of goods and services for final use occurring within the domestic territory of a given country, regardless of the allocation to domestic and foreign claims.

Gross domestic product at purchaser values (market prices) is the sum of gross value added by all resident and non-resident producers in the economy plus any taxes and minus any subsidies not included in the value of the products. It is calculated without making deductions for depreciation of fabricated assets or for depletion and degradation of natural resources. National currency GDP is converted into U.S. dollars at the relevant year's conversion rate.

(Note: The definition is reproduced from the Technical Notes on Country At a Glance data interface of the World Bank. The original definition can be accessed at this link: http://go.worldbank.org/NM88P907Q0)

Implied emission factor
An implied emission factor is defined as emissions divided by the relevant measure of activity:
IEF = Emissions / Activity data

For source/sink categories that are composed of several subcategories, the emissions and activity data in the formula above are summed up across all subcategories. Hence, the implied emission factors are generally not equivalent to the emission factors used to calculate emission estimates, but are average values that could be used, with caution, in data comparisons. For information on actual emission factors, the latest national inventory report for the relevant Party should be consulted.,/p>

Fuel combustion (Sectoral Approach)
Total emissions of all greenhouse gases from all fuel combustion activities. CO₂ emissions from combustion of biomass fuels are not included (see Emissions from Biomass Burning). Other greenhouse gases from biomass fuel combustion are considered net emissions and are included. Incineration of waste for waste-to-energy facilities are included here and not under Waste. Emissions from fuel used in ships or aircraft engaged in international transport are not included here.

Energy Industries
Comprises emissions from fuels combusted by the fuel extraction or energy producing industries.

Transport
Emissions from the combustion and evaporation of fuel for all transport activity, regardless of the sector. Emissions from fuel sold to any air or marine vessel engaged in international transport (international bunker fuels) are not included.

Industrial Processes
By-product or fugitive emissions of greenhouse gases from industrial processes. Emissions from fuel combustion in industry are included under Fuel Combustion.

Solvent and Other Product Use
Emissions resulting from the use of solvents and other products containing volatile compounds. When the solvents and other products are, or are produced from, petroleum products, the carbon in the NMVOC emissions will be included in the CO₂ inventory if the Reference Approach for CO₂ emissions from energy is used. All other non-energy emissions not included under Industrial Processes are included here.

Agriculture
All anthropogenic emissions from agriculture except for fuel combustion and sewage emissions.

Land-use Change and Forestry
Total emissions and removals from forest and land use change activities (activities impact on three different carbon sources/sinks: aboveground biomass, belowground biomass and soil carbon).

Land use, Land-Use Change and Forestry
Total emissions and removals from activities relating to land use, land-use change and forestry (from the following categories: forest land, cropland, grassland, wetlands, settlements and other land).

Waste
Total emissions from solid waste disposal on land, wastewater, waste incineration and any other waste management activity. Any CO₂ emissions from fossil-based products (incineration or decomposition) are not included here. CO₂ from organic waste handling and decay are not included here.

Other
Emissions that do not fit under any other emission source/sink categories of the main categories described above.

International Bunkers
Emissions resulting from fuel use in ships or aircraft engaged in international transport.

Aviation
Emissions resulting from fuel use in aircraft engaged in international transport.

Marine
Emissions resulting from fuel use in ships engaged in international transport.