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Three scales, not a magnitude ranking. Each example stays inside its published unit and evidence boundary.

Household activity

School run by car

What is measured

Passenger kilometres for a school run completed by car.

Equation

1,000 km × 180 g CO₂e / km = 180.0 kg CO₂e

Evidence facts

Published
Unit
km
Boundary
WTT+TTW
Region
CA-ON
Vintage
2023
Uncertainty
Not quantified
1 source
  1. SRC.ECCC.NIR.2025[15] Environment and Climate Change Canada, “National Inventory Report 1990–2023: Greenhouse Gas Sources and Sinks in Canada,” Ottawa, ON, Canada, 2025. Available: https://www.canada.ca/en/environment-climate-change/services/climate-change/greenhouse-gas-emissions/inventory.html

Use this example only within its published unit, geography, boundary, GWP horizon, and vintage. Incompatible units are not a magnitude ranking.

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Small organization

Office building energy use (m²-year)

What is measured

Operational footprint per square metre of office space over one year.

Equation

100 m²·yr × 80000 g CO₂e / m² yr = 8.00 t CO₂e

Evidence facts

Published
Unit
m² yr
Boundary
Operational electricity
Region
CA-ON
Vintage
2024
Uncertainty
Not quantified
1 source
  1. SRC.IEA.NRCAN.BUILDINGS.2024[31] International Energy Agency, “Tracking Clean Energy Progress: Buildings,” Paris, France, 2023; and Natural Resources Canada, “Comprehensive Energy Use Database,” Ottawa, ON, Canada, 2024. Available: https://oee.nrcan.gc.ca/corporate/statistics/neud/dpa/menus/trends/comprehensive_tables/list.cfm

Use this example only within its published unit, geography, boundary, GWP horizon, and vintage. Incompatible units are not a magnitude ranking.

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Canadian system

Ontario grid electricity

What is measured

One kilowatt-hour delivered by the Ontario IESO-managed grid.

Equation

100 kWh × 28 g CO₂e / kWh = 2.8 kg CO₂e

Evidence facts

Published
Unit
kWh
Boundary
Electricity LCA
Region
CA-ON
Vintage
2024
Uncertainty
Not quantified
1 source
  1. SRC.IESO.POWERDATA.2025[32] Independent Electricity System Operator, “Power Data—Emissions and Grid Intensity (Ontario),” 2025. Available: https://www.ieso.ca/en/Power-Data/Data-Directory

Use this example only within its published unit, geography, boundary, GWP horizon, and vintage. Incompatible units are not a magnitude ranking.

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