Learn to Account for Biogenic Carbon in Your Projects
本系列文章旨在帮助开发人员和设计团队在他们的木结构建筑项目中考虑生物碳. 它包括概述，然后是在项目生命周期的每个阶段检查会计实践的文章, the nuances of different life cycle assessment tools, long-term carbon storage and delayed emissions, 以及以与国际标准一致的方式报告生物碳的建议.
Sustainability
Wood has many attributes that make it well suited to sustainable design. Wood products have low embodied carbon compared to other building materials, which indicates fewer greenhouse gas emissions, and they continue to store carbon absorbed by the trees while they were growing. Low embodied carbon + stored carbon = lower carbon impact. Wood is also natural and renewable. It can contribute to energy efficiency and biophilic design, and is durable, adaptable and re-useable. 探索下面的资源，可以帮助你做出明智的可持续发展的决定.
Use these Resources to Inform Your Building Material Choices
Practical guidance on whole building life cycle assessment, biogenic carbon, carbon storage, environmental product declarations, and more.
Expert Tips Introduction to Whole Building Life Cycle Assessment: The Basics
生命周期评价(LCA)用于量化产品或系统生命周期内的环境影响, from initial extraction of raw materials through manufacture, distribution, use, and final disposal.
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When to Include Biogenic Carbon in an LCA Expert Tips -
How to Include Biogenic Carbon in an LCA Expert Tips
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Biogenic Carbon Accounting in WBLCA Tools Expert Tips
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What Net Zero Means in the Building Construction Industry Expert Tips
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Considerations & Worksheet for Structural WBLCA of Mass Timber Buildings Solution Papers
Less Embodied Carbon + Stored Carbon = Lower Carbon Impact
我们如何以可持续的方式建设并实现碳减排目标，同时满足不断增长的人口对住房和基础设施的需求? One answer is more wood buildings.
According to Architecture 2030, 建筑排放了全球近40%的温室气体(GHG). Embodied carbon—i.e., 在结构的整个生命周期中，与材料和施工过程相关的温室气体约占11%, and most of this (9%) is related to the use of concrete, iron and steel.1 Embodied carbon, 尤其是与制造材料和建筑相关的前期排放, can be significant. 与传统非木质建筑相关的前期能源大致相当于运营同一建筑所需的能源 17 years!2
Wood products have low embodied carbon
Manufacturing wood products requires less fossil fuel-based energy than either steel or concrete; most of the energy comes from renewable biomass (e.g., bark and other residual fiber) that would otherwise go to waste.3 用木材代替化石燃料密集型材料减少了隐含碳，是实现我们近期气候目标的重要一步.
Wood buildings store carbon
As trees grow, they absorb carbon dioxide (CO2) from the atmosphere, release the oxygen (O2), and incorporate the carbon into their wood, leaves or needles, and roots. This carbon is referred to as biogenic carbon. 当树木被制成建筑材料时，木材继续储存碳. (Wood is 50% carbon by dry weight.4) By using wood in buildings, 我们在结构的生命周期内将这种碳排除在大气之外——如果木材被回收再利用或回收利用，时间会更长.
“每年有17000座用其他材料建造的建筑可以用木材建造. In most cases, it costs about the same to build with wood, and yet the environmental benefits are significant. Building with innovative wood products from sustainable, 妥善管理森林是一种相对容易的方法，可以减轻大量的美国森林污染.S. carbon emissions.”
– Jennifer Cover, President and CEO, WoodWorks, Testimony to the Committee on Energy and Natural Resources, United States Senate
Forests and cities work together to keep carbon out of the atmosphere
北美采用的可持续森林管理做法对森林-碳循环至关重要. While wood buildings lock carbon into the built environment, the next generation of trees begins to grow and absorb CO2. 这有助于确保我们的森林仍然是碳汇，同时为新建筑创造可持续的木材供应.
木材产品的强劲市场提供了一个经济理由来保持森林而不是将其转为其他用途，从而激励可持续森林管理. They also encourage landowners to invest not only in forest regeneration, 但是，间伐和其他景观恢复工作可以促进森林健康，减少野火的风险.
Have you tried the WoodWorks Carbon Calculator?
输入建筑物中结构木材的体积，该工具将估算其碳影响-包括木材中储存的碳和避免的温室气体排放-以及需要多长时间.S. and Canadian forests to grow that volume of wood. While it doesn’t offer the thoroughness of an LCA, the calculator can help quantify the benefits of a wood structure for your team, client or community.
Five-Story Mass Timber Office: Case Study + LCA
Crescent Real Estate has found that sustainable architecture, including buildings with a lower carbon impact, appeals to a wide range of tenants. Working with OZ Architecture, KL&A Engineers & Builders, and Adolfson & Peterson Construction, Crescent made sustainability a priority for Platte Fifteen, a five-story CLT office building in Denver. In addition to a technical case study on its design and construction, this project also has an in-depth life cycle assessment (LCA) report.
亲生物设计越来越多地用于通过使用自然元素(如日光)与自然建立联系，从而提高居住者的幸福感, plants, water and exposed wood. 这些因素被认为对人类有积极的影响——从减轻压力到提高生产力.
Download the Biophilic Design LookBookEnergy Efficiency
In terms of operating energy与钢和混凝土相比，木材具有导热系数低的优点.5 As a result, wood buildings are easy to insulate to high standards.
而任何结构系统都可以设计成一个紧凑的建筑围护结构, 大量木材系统的精密制造可以提供卓越的气密性. 对于那些想要达到被动式房屋(Passivhaus)标准或创造零能耗建筑的设计师来说，木材也被证明是一个很好的选择. Read about 11 E Lenox in Boston, 这是由Haycon设计公司和Monte French设计工作室设计的一个七层木结构被动式房屋项目.
因为许多因素对能源效率的影响比结构材料的选择更大, 对许多建筑设计师来说，更重要的一点是，木质建筑系统具有低 embodied carbon. LCA研究一致表明，在这一领域，木材的性能优于其他材料.6,7
1 Architecture 2030. Why The Built Environment?
2 Alan Organschi: Building a Global Carbon Sink – YouTube
3American Wood Council. Energy & Environment – Bioenergy.
4Dovetail Partners Inc. Carbon in Wood Products: The Basics.
5 American Wood Council. 什么是木材的导热性，它与其他材料相比如何?
6 R. Sarthe, J. O’Connor, FPInnovations. A Synthesis of Research on Wood Products & Greenhouse Gas Impacts, 2nd Edition.
7 Dovetail Partners, Inc. Building with Wood = Proactive Climate Protection.