Data Sources and Methods for the National Greenhouse Gas Emissions Indicators
Description and rationale of the national greenhouse gas emissions indicators
The greenhouse gas (GHG) emissions indicators report trends in anthropogenic (human-made) GHG emissions at the national level (total emissions, emissions per person and emissions per unit of gross domestic product [GDP]), and at the provincial/territorial and economic sector level for six GHGs: carbon dioxide (CO2), methane (CH4), nitrous oxide (N2O), sulphur hexafluoride (SF6), perfluorocarbons (PFCs) and hydrofluorocarbons (HFCs).
Emissions from natural, unmanaged sources (material decay, plant and animal respiration, volcanic and thermal venting, etc.), and absorption of emissions by natural sinks (forests, oceans), are not captured by these indicators.
The GHG emissions indicators are used to track the progress of Canada’s efforts to lower emissions and reach environmental performance objectives. Use of the GHG indicators in conjunction with economic performance indicators such as the GDP supports national-level decision making on sustainable development.
As an Annex I Party to the United Nations Framework Convention on Climate Change (UNFCCC), Canada is required to prepare and submit a national inventory of anthropogenic sources and sinks of GHGs on an annual basis.
Since direct measurement of emissions from all sources is not possible, the UNFCCC requires that countries develop, update, publish and maintain national inventories using internationally approved and comparable emissions and removals estimation methods for the six GHGs. Canada’s inventory is developed in accordance with the UNFCCC Annex I Inventory Reporting Guidelines which require the use of the Intergovernmental Panel on Climate Change (IPCC) Methodological and Good Practice Guidelines. The IPCC guidelines are approved and developed through an international process that involves testing of methods through preliminary inventory development, country studies, technical and regional workshops, and national and international experts consultations.
 Annex I Parties include industrialized countries and economies in transition.
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