Canada: Tree Planting Could Remove 5x Annual Emissions – Study

A new study suggests Canada could significantly reduce atmospheric carbon dioxide levels through large-scale reforestation efforts along the northern edge of its boreal forest. Researchers estimate that planting trees in this region could remove more than five times Canada’s current annual carbon emissions by the end of the century.

The Shifting Boreal Forest

The boreal forest, a vast belt of trees stretching across northern Canada, Europe, and Russia, is gradually moving northward as the climate changes. This natural shift, particularly in the taiga area where the forest transitions to Arctic tundra, has prompted investigation into the potential for increased carbon sequestration. Study lead author Kevin Dsouza, a postdoctoral researcher at the University of Waterloo in Canada, questioned, “What is the potential for reforestation in these regions, and how much carbon could they sequester?”

Modeling Reforestation Potential

Dsouza and his team utilized satellite data to map forest composition and identify available land within the northern boreal forest. They then employed forestry industry models, factoring in variables like fire probabilities, climate conditions, seedling survival rates, and land type, to project carbon sequestration over the next 75 years.

The study estimates that reforestation of this 6.4 million hectares could remove nearly 4 gigatons of carbon from the atmosphere by 2100, equivalent to five times Canada’s current annual emissions. Expanding reforestation efforts to 32 million hectares (79 million acres) could potentially sequester almost 20 gigatons of carbon.

Past Efforts and Future Challenges

Canada previously launched an ambitious plan to plant 2 billion trees by 2031, but the initiative was canceled last year. As of June 2025, 228 million trees had been planted, with agreements in place for an additional 988 million trees across the country. Dsouza noted that the previous plan’s difficulties stemmed from logistical complexities and insufficient funding, rather than flaws in the science of reforestation itself. He emphasized the need for a more strategic approach, focusing on planting in optimal locations with consideration for economic and community benefits to ensure long-term sustainability.

Alternative Approaches to Carbon Management

While reforestation is seen as a potential solution, other experts propose alternative strategies. Ulf Büntgen, a professor at the University of Cambridge in the U.K., suggests that planting trees offers only a temporary solution. He argues that while trees absorb carbon as they grow, they eventually release it upon decomposition. Büntgen and colleagues published a study in NPJ Climate Action proposing the harvesting and sinking of trees from the boreal forest in the Arctic Ocean, where the cold, oxygen-poor environment would preserve the carbon for millennia. They suggest that managing just 1% of the boreal forest in this way could remove 1 gigaton of carbon dioxide annually.

Frequently Asked Questions

What area of land is considered suitable for reforestation in Canada?

The study identified around 6.4 million hectares (15.8 million acres) of land suitable for reforestation, an area about twice the size of Vancouver Island. Scaling up to 32 million hectares (79 million acres) could yield even greater carbon sequestration.

What happened to Canada’s 2 billion tree planting plan?

Canada’s plan to plant 2 billion trees by 2031 was canceled last year. However, as of June 2025, 228 million trees had been planted, and agreements are in place for an additional 988 million trees.

What is an alternative approach to managing carbon in the boreal forest?

Researchers have proposed harvesting trees from the boreal forest and sinking them in the Arctic Ocean, where the cold and oxygen-poor environment would preserve the carbon for thousands of years. They suggest managing 1% of the boreal forest in this way could remove 1 gigaton of carbon dioxide each year.

As research continues and strategies evolve, will a combination of approaches prove most effective in leveraging the boreal forest for climate mitigation?