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Towards a bio-economy: the role of the forest Biomass has an increasingly important role in replacing fossil and mineral resources, and it is central in environmental impact-reduction strategies in companies and governments, locally, nationally and internationally. The European Union (EU) has recently taken action to strengthen the bio-economy, defined as "…the sustainable production and conversion of biomass into a range of food, health, fibre and industrial products and energy". Two thirds of the land area in Sweden is covered by forests, and forestry has been an important industry for centuries. Increased and/or more efficient use of forest biomass thus has a great potential for replacing the use of fossil and mineral resources in Sweden. There are two main reasons for why forest- and other bio-based products are seen as environmentally beneficial. Biomass is (most often) a renewable resource, in contrast to finite fossil and mineral resources, and there is often a balance between CO2 captured when the biomass grows, and CO2 released when the bio-based product is incinerated. The challenge: calculate carbon footprints Moving towards a bio-economy means replacing non-renewable fuels and materials with bio-based fuels and materials. This is a transition on many levels: technology, business models, infrastructure, political priorities, etc. To guide such a grand transition, there is a need to understand the environmental implications of new bio-based products. This includes assessing their climate impact, so-called carbon footprinting. Carbon footprinting of forest products is not as simple as saying that forest products are carbon and climate neutral by definition. Fossil energy used for producing and transporting the products has a carbon footprint. Also, the carbon balance can differ between forest products, which can influence their carbon footprint. For example, carbon stored in products, while CO2 is captured in the re-growing forest, can mitigate climate change. The modelling of the carbon balance is influenced by the study's geographical system boundaries – national, regional, landscape and single-stand perspectives often yield different results. Forestry can also lead to positive or negative changes in the levels of carbon stored in the soil, the levels of aerosols emitted by the trees (influencing cloud formation), and the albedo (surface reflectivity) of the forest land. An indirect effect of forestry can be increased competition for land, with expanding or intensified land use elsewhere, with positive or negative climate effects. All these factors are potentially important when calculating carbon footprints. There is limited knowledge about how and to which extent the aforementioned factors influence the carbon footprint of forest products. Also, there is a lack of methods for assessing some of these factors. In light of this, can the carbon footprints of today be trusted? And can we ensure that they provide relevant and robust decision support? Our approach: testing three different carbon footprint methods in five case studies In this study, we have: Identified different carbon footprint methods. Used the identified methods to calculate the carbon footprint of different forest products and non-forest benchmarks (using life cycle assessment, LCA). Compared the results to find out how and why they differ. We identified three main categories of carbon footprint methods: (i) the common practice in LCA, (ii) recommendations in standards and directives (we tested the EU sustainability criteria for biofuels and bioliquids and the Product Environmental Footprint (PEF) guide), and (iii) more advanced methods proposed in the scientific literature (we tested dynamic LCA). For dynamic LCA, we tested different time horizons (20 and 100 years) and different geographical system boundaries, based on (a) the national level, assuming a net annual growth of biomass (which is the case in Sweden); (b) the landscape level, assuming a balance between the annual harvesting and growth (the level at which forests are often managed); and (c) the stand level, assuming regrowth during a time period of 80 years (a stand is the part of a landscape that is harvested in one year, a level often used by researchers developing new methods for modelling the dynamics of forest carbon flows). These methods were applied to five forest products: two automotive fuels (a lignin-based fuel produced from black liquor and butanol), a textile fibre (viscose), a timber structure building, and a chemical (methanol, used for different end products). Our findings We found that different carbon footprint methods can give different results. The common practice is close to the recommendation in the EU sustainability criteria and the PEF guide. Results from dynamic LCA differ considerably, as it accounts for the timing of (fossil and biogenic) greenhouse gas (GHG) emissions and CO2 capture, which is ignored by the other methods. The results of dynamic LCA depend primarily on the geographical system boundaries, but also on the time horizon. When applying dynamic LCA with a stand perspective, we assumed that the CO2 uptake occurs after harvest. Alternatively, one could assume that the CO2 uptake occurs before harvest, which would give different (lower) results. When comparing the carbon footprints of the forest products with products they could be expected to replace, we see that the results for the forest products could range from being definitely favourable to worse. More results can be found in the full report. Results were produced to answer the research questions of this study, and should not be used out of context. Conclusions and recommendations Because there is (still) limited knowledge about how forest products influence the climate, and as carbon footprints will always depend on value-based assumptions (e.g. regarding geographical system boundaries), it is not possible to recommend one specific method which is suitable regardless of context. As different carbon footprint methods can give very different results, our key message is that we need to increase consciousness on these matters. It is important to be aware of the assumptions made in the study, the effects of those assumptions on results, and how results can and cannot be used for decision support in a certain context. More specific recommendations for decision makers are listed below. Further details and results can be found in the main report, along with recommendations for LCA practitioners and researchers. Decision makers must be aware that the main methodological choices influencing carbon footprints of Swedish forest products are the choice of geographical system boundaries (e.g. national-, landscape- or stand-level system boundaries) and whether the timing of CO2 capture and GHG emissions is accounted for. This is because Swedish forests are, in general, slow growing. If the aim of the decision is to obtain short-term climate impact reduction – for example, the urgent reduction that is possibly needed for preventing the world average temperature to rise with more than 2°C – the timing of CO2 capture and GHG emissions should be taken into account. Decision makers must be aware that a particular method for capturing timing (such as dynamic LCA) can be combined with different system boundaries, which can yield different results. When conclusions from existing LCA studies are synthesized for decision support, the decision maker must be aware that most existing studies do not account for the timing of CO2 capture and GHG emissions. This is particularly important when the decision concerns the prioritization of forest products with different service lives (e.g., fuels versus buildings). When timing is considered, decision makers must be aware that there are different views on when the CO2 capture occurs, which will influence the carbon footprint. One could either consider the CO2 captured before the harvest (i.e., the capture of the carbon that goes into the product system), or the CO2 captured after the harvest (i.e., the consequence of the harvest operation). In this study, we tested the second alternative when we applied dynamic LCA with a stand perspective – this does not mean we advocate the use of the second alternative over the first alternative. Decision makers must be aware that the location and management practices of the forestry influence the climate impact of a forest product. For example, growth rates, changes in soil carbon storages and fertilisers (a source of GHGs) differ between locations. Based on our results, we cannot say that the carbon footprints of some product categories are more robust than for others, i.e. less influenced by choice of methodology. However, the more forest biomass use in the product system, the higher the influence of the choice of method. As many interactions between the forest and the climate are still not fully understood, it is important to be open to new knowledge gained in methodology development work. Regarding how to use Swedish forests for the most efficient climate impact reduction, it is impossible to draw a general conclusion on the basis of our results. Factors that influence the "optimal" use are:Which fraction of forest biomass that is used. Various products use different fractions (as was the case in our case studies) and do not necessarily compete for the same biomass. However, a production system may be more or less optimised for a specific output. So there may be situations of competition also when feedstocks are not directly interchangeable. Which non-forest product that is assumed to be replaced by the forest product (if any). The carbon footprint of the non-forest product matters, but also how large the substitution effect is (i.e., does the forest product actually replace the non-forest alternative, or merely add products to the market, and what are the rebound effects from increased production?). If all other factors are identical: the longer the service life of the forest product the better, due to the climate benefit of storing carbon and thereby delaying CO2 emissions. This effect is particularly strong if the aim is to obtain short-term climate impact reduction. Moreover, the effect supports so-called cascade use of forest biomass, e.g. first using wood in a building structure, then reusing the wood in a commodity, and at end-of-life, as late as possible, recovering the energy content of the wood for heat or fuel production. Traditional LCA practice and methods required by the EU sustainability criteria and PEF have limitations in the support they can provide for the transition to a bio-economy, as they cannot capture the variations of different forest products in terms of rotation periods and service lives. Thus, decision makers need to consider studies using more advanced methods to be able to distinguish better or worse uses of forest biomass. We have tested one such advanced method (dynamic LCA), that proved applicable in combination with several different geographical perspectives, but also other methods exist (e.g. GWPbio). Climate change is not the only environmental impact category which is relevant in decision making concerned with how to use forests. Other environmental issues, such as loss of biodiversity and ecosystem services, are also important. There are also non-environmental sustainability issues of potential importance, e.g. related to indigenous rights and job creation. ; The method's influence on climate impact assessment of biofuels and other uses of forest biomass

Skogsråvara används idag till olika ändamål, som till exempel pappersprodukter av olika slag, sågade trävaror och energi – huvudsakligen i form av fasta bränslen. Det finns även en viss produktion av drivmedel, men inte i så stor skala som förväntas i framtiden. Utvecklingen av sådan tillverkning är intensiv och biobaserade drivmedel eftersträvas och premieras med bland annat styrmedel och politiska mål. Biomassa är en förnyelsebar resurs och som sådan mycket intressant för många användningsområden, som till exempel nya material och flytande och gasformiga bränslen och drivmedel. Framställningen av biodrivmedel kommer med all sannolikhet att öka under de kommande åren – i synnerhet som Sverige har ett mål om en fossiloberoende fordonsflotta till år 2030. Skogen ska, förutom att vara råvara till ovanstående typer av produkter, också tillgodose behoven av de så kallade ekosystemtjänsterna, som till exempel biodiversitet, fiske, jakt, rekreation och bärplockning som därmed också konkurrerar om denna råvara. Idag har Sverige en netto-tillväxt av skog, vilket, åtminstone teoretiskt, ger utrymme för ökat uttag av skogsbiomassa i Sverige och därmed en ökad tillverkning av produkter därav. Tillgången på skogsbiomassa är dock inte obegränsad eftersom tillväxten måste vara lika med, eller större, än uttaget. Därför måste skogsbiomassa betraktas som en begränsad resurs och dess användning bör vara sådan att den ger maximal fördel jämfört med användning av fossila resurser. Det medför att LCA och andra utvärderingar av miljömässiga konsekvenser av en produkt från skogsbiomassa bör inkludera alternativa råvaror för produkter som konkurrerar om samma råvara. Denna förstudie omfattar en beskrivning av svenskt skogsbruk och sambandet mellan olika kvaliteter av skogsbiomassa, en workshop (vid vilken konkurrensen om skogsbiomassa diskuterades med experter i ämnet), en teoretisk diskussion om indirekta effekter och biomasse-potentialer, samt två fallstudier i vilka de teroetiska resonemangen appliceras. Traditionella utvärderingar av produkters miljöbelastning inkluderar inte begränsning av tillgång på råvara eller konkurrens om densamma, vilket, bland annat för produktionen av bioetanol har befunnits ha stor betydelse. Samma sak gäller även för andra produkter från skogsbiomassa. Den huvudsakliga slutsatsen av studien är att alternativa råvaror för produkter som konkurrerar om skogsråvaran måste inkluderas när miljöbelastningen av en skogsråvarubaserad produkt analyseras. Detta är mycket komplext eftersom indirekta effekter är svåra att förutse och beror på många faktorer, som exempelvis marknadslägen, styrmedel och politiska mål. Icke desto mindre är frågan viktig för att utvecklingen av biobaserade råvaror ska bidra till en så minskad miljöbelastning som möjligt jämfört med de fossilbaserade motsvarigheterna. ; Forest biomass is used for many products including paper based products, sawn wood products and solid fuels. The production of forest derived liquid transportation fuels is currently limited but predicted to increase. Biomass is a renewable resource and therefore of high interest for applications such as new innovative materials, liquid and gaseous fuels. The production of various biofuels for transportation is forecast to increase and Sweden has a goal of a fossil-independent transportation system by 2030. Other, non-material, uses of forest biomass include the so called eco system services biodiversity, fishing, hunting, recreation, berry picking etc. which are also competing for forest biomass. There is currently a net growth of forest in Sweden, which theoretically could allow for an increased use of this resource. However, the amount of forest biomass is not unlimited and its harvest should not exceed its growth. Therefore, forest biomass should be considered as a limited resource and its use should aim to maximize the environmental benefit compared to the use of fossil resources. For this reason, environmental impact evaluations of forest biomass based products should include alternative sources for products competing with this resource. The pre-study reported herein included: a review of Swedish forestry and the relationships between different types of forest biomass and fuels; a workshop in which the competition for forest biomass was discussed with experts in the area; a theoretical reasoning around indirect effects and biomass potentials; and two case studies in which the theoretical reasoning is applied. Traditional assessments of environmental impacts of products and processes do not include the aspect of resource scarcity or competition for raw materials. In the case of bioethanol this has been shown to affect the results of such evaluation andthe same thing applies also to other forest biomass based fuels. The main conclusion of the study is that alternative sources for products competing with forest biomass should be taken into account when assessing the environmental impacts of forest biomass derived products. This is, however, complex as indirect effects are difficult to predict and depend on numerous factors including market situations, financial instruments, legislation and policies etc. Nevertheless, the question is important for the development of biobased substitutes for fossil derived products .