GHGRP 2021: Emissions by GHG
•Emissions Trends •Emissions by GHG •Emissions by Location •Emissions Ranges
Sector Data Highlights
•Chemicals (Non-Fluorinated Chemicals) (Fluorinated Chemicals) •Electrical Equipment •Electronics Manufacturing •Metals •Minerals •Miscellaneous Combustion •Petroleum and Natural Gas Systems (Onshore Production) (Other Industry Segments) •Power Plants •Pulp & Paper •Refineries •Underground Coal Mines •Waste •Suppliers •Natural Gas and Natural Gas Liquids •Petroleum Products •Industrial GHGs & Products Containing GHGs •Supply, Underground Injection, and Geologic Sequestration of CO2 •Fluorinated GHG Emissions and Supplies
Carbon dioxide is the GHG emitted in the largest quantities. The 2.47 billion metric tons of CO2 reported for 2021 represent 91.3% of the GHGs reported in 2021a. Methane emissions represent 7.3% of reported 2021 GHG emissions, N2O represents 0.9%, and fluorinated gases (HFCs, PFCs, SF6, NF3, Other Fully Fluorinated GHGs, HFEs, Very Short Lived Compounds, Other) represent 0.5% (Figure 1).
a The Inventory of U.S. Greenhouse Gas Emissions And Sinks for 2021 is not yet available. In 2020, CO2 represented 78.8% of total U.S. GHG emissions.
Figure 1: Direct Emissions by GHG (2021)
The table below lists the primary sectors emitting each GHG.
| Greenhouse Gas | Source Categories Contributing Most to Emissions1 | Sectors Contributing Most to Emissions |
|---|---|---|
| CO2 | Electricity Generation (D), Stationary Combustion (C) | Power Plants, Petroleum and Natural Gas Systems, Refineries |
| CH4 | Municipal Landfills (HH), Petroleum & Natural Gas Systems (W) | Waste, Petroleum and Natural Gas Systems |
| N2O | Nitric Acid Production (V), Adipic Acid Production (E), Electricity Generation (D) | Chemicals, Power Plants |
| PFCs | Electronics Manufacturers (I), Fluorinated GHG Productions (L) | Other, Chemicals |
| HFCs | HCFC–22 Production and HFC–23 Destruction (O), Fluorinated Gas Production (L) | Chemicals |
| SF6 | SF6 from Electrical Equipment (DD), Electronics Manufacturers (I) | Other |
| NF3 | Electronics Manufacturers (I), Fluorinated Gas Production (L) | Other, Chemicals |
1 These source categories account for 75 percent or more of the reported emissions of the corresponding GHG. The subpart under which the emissions were reported is shown in parentheses.