Data Except where noted, this report covers all operations of Weyerhaeuser during calendar year 2006, including the company’s fine paper business and related assets that were transferred to Domtar Inc. in March 2007. Financial results are for fiscal 2006. The 2006 environmental data in this report cover: • Weyerhaeuser operations owned in 2006. Joint ventures are not included except for NORPAC, a newsprint mill. • Forestry operations worldwide. • All wood products, pulp, paper, bag and corrugated packaging manufacturing facilities in the United States and Canada (26 pulp and paper facilities; 82 ink, bag, corrugated packaging and converting locations; and 78 wood products reporting locations). Environmental data for our recycling plants and distribution centers are not included because these sites have a minimal environmental impact relative to our other manufacturing operations. We continue to improve our processes for collecting environmental, health and safety data from our manufacturing operations outside of the United States and Canada. Where that information is available, it is included and noted in this report. Use of GRI guidelines Weyerhaeuser has published an annual environmental performance report since 1993 and a citizenship report since 2001. In 2002, we combined these reports into this sustainability report and began following guidelines recommended by the Global Reporting Initiative. In 2004, we issued our first report “in accordance” with the guidelines. In 2005, we had our “in accordance” report checked by the GRI. This is our first report produced using the G3 guidelines to an application level of “A.” Our sustainability reports since 2002 can be found on www.weyerhaeuser.com. The codes (e.g., EN 10, HR 5) shown in the GRI Index refer to specific GRI indicators. For more information about GRI and its indicators, please visit www.globalreporting.org. Report content Publishing our sustainability report facilitates transparency in the company’s disclosure of relevant sustainability information. Our process for determining report content includes: • Identifying key audiences for the report, including customers, investors, current and potential employees, and other stakeholders. • Determining the information needs of our audiences based on our internal tracking of stakeholder inquiries, broader sustainability trends, and discussions with key users of the report. • Comparing these content needs with the Global Reporting Initiative indicators and prioritizing topics within the report. • Measuring our sustainability performance. In this year’s report, you’ll see dashboard icons at the beginning of each section. This is our first year to rate our performance in key areas in this manner. We will refine and improve the dashboard measures in the coming years. How data in this report were verified The Weyerhaeuser data contained in this report are drawn from: • Established internal databases that are used regularly by our operations. • Annual internal surveys. Environmental data are obtained in a number of ways at Weyerhaeuser facilities, including physical measurement, representative and other sampling, application of standard government factors, and recognized industry factors. Calculations were performed using measured data as well as commonly recognized engineering standards. All equations and estimations that were used in calculating environmental data reported in this document have been accepted industrywide and by all pertinent regulatory authorities. In addition, each section of the report is reviewed by an internal subject-matter expert to ensure accuracy. The final draft of the report is reviewed by members of Weyerhaeuser’s Disclosure Committee and key senior leaders to ensure material information is accurately communicated. Weyerhaeuser has evaluated options for external verification of data and does not currently externally verify all of the data included in this report. We continue to monitor stakeholder interest and trends in external verification.