A new University of Alberta study calculates that there are 277 billion trees in the North American boreal forest, including 30 billion in Alberta, and it could benefit climate mitigation. Estimated using a sophisticated machine learning algorithm, the numbers are 31 per cent higher than a count made through an earlier attempt in a major 2015 global study. “Our research provides by far the most accurate and credible answer to the question of how many trees are in our boreal forests,” says study lead Fangliang He, a forest ecologist and Canada Research Chair in Biodiversity and Landscape Modelling in the Faculty of Agricultural, Life & Environmental Sciences. The work fills a crucial knowledge gap that “reduces the uncertainty in estimating and managing tree density to promote forest productivity that enhances forest carbon sink potential,” he adds. “Knowing that there are 31 per cent more trees than previously estimated suggests our boreal forests have greater capacity to mitigate climate change.”