WY: 10-K Risk Factor Changes

We have manufacturing operations in Canada. We are also an exporter and compete with global producers of products very similar to ours. Therefore, we are affected by changes in the strength of the U.S. dollar, particularly relative to the Canadian dollar, euro, yuan and yen, and the strength of the euro relative to the yen. Changes in exchange rates could materially and adversely affect our sales volumes, margins and results of operations. WEYERHAEUSER COMPANY > 2025 ANNUAL REPORT AND FORM 10-K 36 WEYERHAEUSER COMPANY > 2025 ANNUAL REPORT AND FORM 10-K 36 Table of Contents Table of Contents Table of Contents LEGAL, REGULATORY AND TAX RISKS ENVIRONMENTAL LAWS AND REGULATIONSWe could incur substantial costs as a result of compliance with, violations of, or liabilities under applicable environmental laws and other laws and regulations.We are subject to a wide range of general and industry-specific laws and regulations relating to the protection of the environment and wildlife, including those governing:  air emissions,  wastewater discharges,  harvesting,  silvicultural activities, including use of pesticides and herbicides,  forestry operations and endangered species habitat protection,  surface water management,  the storage, usage, management and disposal of hazardous substances and wastes,  the cleanup of contaminated sites,  landfill operation and closure obligations,  building codes and  health and safety matters. We have incurred, and we expect to continue to incur, significant capital, operating and other expenditures complying with applicable environmental laws and regulations and as a result of remedial obligations, and there can be no assurances that existing accruals for specific matters will be adequate to cover future costs. We also could incur substantial costs, such as civil or criminal fines, sanctions and enforcement actions (including orders limiting our operations or requiring corrective measures, installation of pollution control equipment or other remedial actions), cleanup and closure costs, and third-party claims for property damage and personal injury as a result of violations of, or liabilities under, environmental laws and regulations.As the owner and operator of real estate, we may be liable under environmental laws for cleanup, closure and other damages resulting from the presence and release of hazardous substances on or from our current or former properties or operations. In addition, surface water management regulations may present liabilities and are subject to change. The amount and timing of environmental expenditures is difficult to predict, and in some cases, our liability may exceed forecasted amounts or the value of the property itself. The discovery of additional contamination or the imposition of additional cleanup obligations at our sites or third-party sites may result in significant additional costs.We also lease some of our properties to third-party operators for the purpose of exploring, extracting, developing and producing oil, gas, rock and other minerals in exchange for fees and royalty payments. These activities are also subject to federal, state and local laws and regulations. These operations may create risk of environmental liabilities for any unlawful discharge of oil, gas or other chemicals into the air, soil or water. Generally, these third-party operators indemnify us against any such liability, and we require that they maintain liability insurance during the term of our lease with them. However, if for any reason our third-party operators are not able to honor their indemnity obligation, or if the required liability insurance were not in effect, then it is possible that we could be deemed responsible for costs associated with environmental liability caused by such third-party operators.Any material liability we incur as a result of activities conducted on our properties by us or by others with whom we have a business relationship could adversely affect our financial condition.We also anticipate public policy developments at the state, federal and international level regarding climate change and energy access, security and competitiveness. As discussed below, we expect these developments to address emission of carbon dioxide, renewable energy and fuel standards, and the monetization of carbon. These developments may also include mandated changes to energy use and building codes which could affect homebuilding practices. Enactment of new environmental laws or regulations or changes in existing laws or regulations, or the interpretation of these laws or regulations, might require significant expenditures. We also anticipate public policy developments at the state, federal and international level regarding taxes and a number of other areas that could require significant expenditures.LEGAL AND REGULATORY RISKS RELATED TO CLIMATE CHANGEGovernmental response to climate change at the international, federal and state levels may affect our financial condition, results of operations, cash flows and financial condition.There continue to be numerous international, U.S. federal and state-level initiatives and proposals to address domestic and global climate issues. Within the U.S. and Canada, some of these proposals would regulate and/or tax the production of carbon dioxide and other greenhouse gases to facilitate the reduction of carbon compound emissions into the atmosphere and provide tax and other incentives to produce and use cleaner energy. Indeed, such regulations have already been passed into law in some Canadian provinces and in Washington state, where we have mill operations. Climate change effects, if they occur, and governmental initiatives, laws and regulations to address potential climate