This inventory is based on a “consumption approach”, i.e. it includes not only GHG emissions occurring within the Montreal community, but also GHG emissions linked to imports of goods and services from other territories. The inventory was built using an EEIO (Environmentally-Extended Input-Output) approach, in line with the PAS 2070 methodology adopted by the C40 group of cities. The year 2017 was chosen, as it corresponds to the most recent year for which the data required for the study is available. The inventory was calculated using Open IO-Canada, a Canada-specific EEIO table developed by the CIRAIG. The inventory was built in two stages. First, the Open IO-Canada results obtained for an average Quebecer were scaled to the population of the Montreal community. This first step enabled to identify the main contributors to the inventory, and thus to determine the consumption data to be collected as a priority in order to adapt to the Montreal context. Secondly, consumption data specific to the Montreal context was collected and connected to the Open IO-Canada model. In particular, household consumption expenditure, which accounted for 76% of the GHG inventory obtained after the first stage, was adapted for the Montreal context. These expenditure data come from surveys conducted by Statistics Canada. According to the results of this study, the Montreal community emitted 26.1 million tonnes of CO2 equivalent (Mt CO2 eq.) in 2017. Households are mostly responsible for these emissions (76%), followed by capital investments (17%) and federal, provincial and municipal governments (7%). The main sectors of household consumption are the use of private vehicles, food (mainly beef and dairy products) and the use of fossil fuels at home (for heat production and cooking).