From Carbon Accounting to Net Cooling: Securing the Albedo-Carbon Double Win in Canada’s Boreal Forest

 

Key Messages

• Canada’s large-scale afforestation and reforestation efforts are central to its climate commitments. Yet, the current practices measure carbon storage without fully accounting for surface heat absorption or wildfire vulnerability. This creates a strategic risk: forests may appear climate-positive in carbon accounting frameworks while delivering weaker or unstable long-term cooling.
• Long-term modelling studies in northern Canada show that forest design determines climate performance. Mixed-species forests that include 25–40 percent deciduous trees and are planted at moderate density (600–1,400 trees/ha) consistently deliver stronger and more durable climate cooling than dense evergreen monocultures¹,². They store substantial long-term carbon, reflect more winter sunlight, and reduce fire intensity.
• Dense evergreen plantations, by contrast, absorb more solar radiation during snow seasons and intensify fuel continuity, increasing warming and wildfire risk³,⁴. In drought-prone zones, these forests may become unstable climate assets.
• Afforestation and reforestation investments would benefit from prioritizing mixed-species, moderate-density forests in hydrologically viable zones, while avoiding planting in high fire-risk margins.
• Canada is encouraged to shift from a carbon-quantity approach toward a Net Cooling standard that integrates carbon storage, surface reflectivity, and permanence screening.
• Climate leadership now depends not on planting more trees, but on planting forests that deliver durable cooling.

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