Farms and forests are sources and sinks of greenhouse gases. - Land management practices can reduce greenhouse gas emissions and increase carbon storage. The 2008 Farm Bill directed the U.S. Department of Agriculture to develop technical guidelines to help forest, farm, and ranch managers quantify the changes in their greenhouse gas footprint that could result from a change in management practices. Forest Service scientists played key roles in developing the methods recommended for measuring changes in greenhouse gas emissions and carbon storage in managed forests. The team's goal was to produce transparent and scientifically sound guidelines. These methods were reviewed by federal greenhouse gas specialists, academic experts, and the public. The report, "Quantifying Greenhouse Gas Fluxes in Agriculture and Forestry: Methods for Entity-Scale Inventory," was published in July 2014 and will serve as the blueprint for the development of user-friendly web-based greenhouse gas inventory tools. These tools will enable landowners to estimate changes in greenhouse gas emissions and carbon stocks that result from changes in forest management practices, allowing them to participate in emerging markets for carbon and other ecosystem services.