Greenhouse gas emissions indicators: data sources and methods, chapter 3

3. Data

3.1 Data source

The Greenhouse Gas Emissions indicators are based on greenhouse gas (GHG) emissions data taken from Environment and Climate Change Canada's National Inventory Report 1990-2015: Greenhouse Gas Sources and Sinks in Canada. Data used to develop the emission and removal estimates presented in the National Inventory Report are drawn from published and unpublished sources from various government departments, industry sources and scientific papers. The methods used to prepare the emission and removal estimates are consistent with internationally accepted Intergovernmental Panel on Climate Change methodologies and reference documents. Figures 1-2 and 1-3 of the National Inventory Report illustrate the inventory preparation process and show the main partners involved in preparing the annual inventory. A comprehensive discussion of emissions from all data sources (disaggregated by sector and sub-sector) can be found in chapters 3 through 7 of the National Inventory Report.

3.2 Spatial coverage

Greenhouse gas emission estimates are provided at the national and provincial/territorial levels and by economic sector.

3.3 Temporal coverage

Greenhouse gas emission and removal estimates are compiled annually and reported for the period from 1990 to 2015. Complete details of the temporal coverage for each data source used for the indicators can be found in chapters 3 through 7 of the National Inventory Report.

3.4 Data completeness

Although the Greenhouse Gas Emissions indicators are comprehensive, some emission sources have not been included in the indicators because they are not reported in the National Inventory Report. Owing to their relatively small contributions to the total emissions, these excluded sources do not significantly affect the overall completeness of the inventory. A detailed explanation of the excluded emission sources can be found in Annex 5 of the National Inventory Report.

3.5 Data timeliness

The data included in the indicators cover the period from 1990 through the end of 2015. Preparation of the GHG emissions inventory takes almost 16 months from the end of the last reporting year because of the time needed to collect, validate, calculate and interpret the data.

Between November and January, emission estimates are prepared by Environment and Climate Change Canada's Pollutant Inventories and Reporting Division with input from numerous experts and scientists across Canada. From January through March, the National Inventory Report text and accompanying emissions data tables are developed. This material is reviewed by external experts and Environment and Climate Change Canada officials, and finally submitted electronically to the United Nations Framework Convention on Climate Change, typically by mid-April.

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