Emissions by sector
Little progress in reducing waste emissions highlights the importance of a more ‘circular economy’, including waste prevention and landfill diversion.
1.89 MtCO2eq
3.7% of GTHA carbon emissions
Total Waste Emissions 2015-2021
Total Waste Emissions 2015-2021

Waste emissions have seen little change over the last seven years and currently account for approximately 3.7% of the GTHA’s total emissions. The 2021 waste emissions are estimated based on population growth, assuming per capita emissions remained the same as in 2020.

The predominant component of waste emissions is methane, released as organic waste is broken down by bacteria in landfills. As a greenhouse gas, methane is significantly more potent than carbon dioxide, particularly within its first 20 years in the atmosphere. While this inventory uses the conventional 100-year carbon equivalency for methane, a 20-year carbon timeframe would roughly show triple the emissions, better representing the actual amount of greenhouse gasses released in the short term.

Landfill gas management systems are an important tool for reducing waste emissions as they allow methane to be captured and subsequently flared or used to create low-carbon energy. However, the most effective way to reduce waste emissions is to prevent waste from entering landfills altogether. To achieve this, we will need to transition away from single-use products and strive to develop a robust circular economy that prioritizes the reuse of resources. Many municipalities have taken steps in this area, prioritizing it in their long-term waste management plans. TAF will monitor the impacts of such initiatives in the coming years.