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Managing forests and forest products has substantial potential to help mitigate climate change but the cost has not been extensively examined in Canada. We estimated the cost of seven forest-related mitigation strategies in Canada's 230 million hectares of managed forest, divided into 32 spatial units. For each strategy and spatial unit, we determined forest sector mitigation cost per tonne (t) using estimated impacts on forest sector greenhouse gas emissions and removals and net revenue. National cost curves showed that mitigation averaged 11.0 Mt C[O.sub.2]e x [year.sup.-1] in 2015-2050 at costs below $50 x t C[O.sub.2]e x [year.sup.-1] for a strategy of increased recovery of harvested biomass, increased salvage, extraction of harvest residues for bioenergy, and increased production of longer lived products. We also examined national portfolios in which the strategy selected for each spatial unit (from among the seven examined) was chosen to maximize mitigation or minimize costs. At low levels of mitigation, portfolios chosen to minimize costs were much cheaper than those that maximized mitigation, but overall, they yielded less than half the total mitigation of the latter portfolios. Choosing strategies to maximize mitigation in 2015-2050 yielded an average of 16.5 Mt-year-1 at costs below $50 x t C[O.sub.2]e x [year.sup.-1]. Our analysis suggests that forest-related strategies may be cost-effective choices to help achieve long-term emission reductions in Canada. Key words: Canada, cost, climate change mitigation, forest management, harvested wood products. L'amenagement des forets et les produits forestiers ont un potentiel considerable pour attenuer les changements climatiques, mais au Canada peu d'etudes ont examine les couts associes a ces mesures. Nous avons estime le cout de sept strategies d'attenuation en milieu forestier dans les 230 millions d'hectares de forets amenagees du Canada divisees en 32 unites spatiales. Pour chaque strategie et chaque unite spatiale, nous avons determine le cout par tonne (t) de l'attenuation due au secteur forestier en ayant recours a l'estimation des impacts sur l'emission et l'absorption de gaz a effet de serre et sur le revenu net associes au secteur forestier. Selon les courbes de cout nationales, le niveau d'attenuation atteindrait en moyenne 11,0 Mt eq. C[O.sub.2] x [an.sup.-1] de 2015 a 2050 a un cout de moins de 50 $-t eq. [C[O.sub.2].sup.-1] pour une strategie qui inclut la recuperation accrue de la biomasse recoltee, une plus grande recuperation, la recolte des residus forestiers pour la bioenergie et une augmentation de la production de produits qui ont une plus longue duree de vie. Nous avons aussi evalue les portefeuilles nationaux dans lesquels la strategie selectionnee pour chaque unite spatiale (parmi les sept strategies etudiees) a ete choisie pour maximiser l'attenuation et minimiser les couts. Pour des niveaux d'attenuation faibles, les portefeuilles qui ont ete retenus pour minimiser les couts etaient beaucoup moins dispendieux que ceux qui maximisaient l'attenuation, mais globalement ils ont produit moins de la moitie de l'attenuation totale. Choisir des strategies qui maximisent l'attenuation de 2015 a 2050 entrainerait une reduction moyenne des emissions de 16,5 Mt x [an.sup.-1] a un cout de moins de 50 $-t eq. [C[O.sub.2].sup.-1]. Notre analyse indique que les strategies en lien avec le secteur forestier peuvent etre des choix rentables pour atteindre les objectifs a long terme de reduction des emissions au Canada. [Traduit par la Redaction] Mots-cles: Canada, cout, attenuation des changements climatiques, amenagement forestier, recolte de produits forestiers., 1. Introduction Management of forests and forest products has substantial global potential to mitigate climate change by reducing greenhouse gas (GHG) emissions or increasing carbon sequestration (Barker et al. 2007; [...]

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