This document is a technical annex to the U.S. Greenhouse Gas Emissions and Sinks Inventory, outlining the methodologies used to measure and categorize national greenhouse gas emissions from 1990 to 2015. It identifies 'key categories' — the emission sources with the greatest impact on total national greenhouse gas levels, trends, and uncertainty — using standardized IPCC guidelines. The largest emission sources identified include road transportation, coal-fired electricity generation, and natural gas combustion across industrial, residential, and commercial sectors.Open full document
Notes
This document presents eight annexes to the U.S. Greenhouse Gas Emissions and Sinks Inventory covering the period 1990-2015. The annexes provide supplementary methodological detail, key category analysis, uncertainty assessments, and QA/QC procedures as required by UNFCCC reporting guidelines. Annex 1 identifies key emission source categories for the United States using IPCC Approach 1, Approach 2, and qualitative methods.