Environment

in Fact sheets

Carbon emissions

Direct (Scope 1) Emissions
2019metric tons CO2e 2018metric tons CO2e 2017metric tons CO2e
Direct (Scope 1) emissions 34,406,941 33,268,228 32,429,263
Mainline aircraft (conventional fuel) 34,263,909 33,131,326 32,279,499
Mainline aircraft (sustainable aviation fuel)1 −6,850 −3,776 −5,836
Mainline vehicles (diesel, gasoline, CNG, LPG) 65,161 52,095 69,104
Facilities (natural gas combustion, engine test cells) 80,573 84,804 83,100
Dry ice from catering 4,147 3,779 3,397
Indirect (Scope 2) emissions
2019metric tons CO2e 2018metric tons CO2e 2017metric tons CO2e
Indirect (Scope 2) emissions 189,682 171,731 331,527
Electricity consumption (location-based) 201,690 193,476 323,889
Electricity consumption (market-based) 189,682 171,731 Not reported
Steam consumption 0 0 7,637
Other Indirect (Scope 3) Emissions
2019metric tons CO2e 2018metric tons CO2e 2017metric tons CO2e
Other Indirect (Scope 3) emissions 7,471,298 6,867,174 6,079,488
Regional aircraft and bus-operated flights (conventional fuel) 7,025,889 6,669,047 5,977,955
Regional vehicles (diesel, gasoline, CNG, LPG) 24,588 25,276 1,784
Ownership stakes in other companies 244,618 172,851 99,750
Employee commuting 176,205 Not reported Not reported
Other Indirect (Scope 3) Emissions
2019metric tons CO2e 2018metric tons CO2e 2017metric tons CO2e
Gross GHG emissions 42,067,921 40,303,454 38,840,278
Carbon offsets −15,425 0 0
Net GHG emissions 42,052,496 40,303,454 38,840,278
Other Indirect (Scope 3) Emissions
2019metric tons CO2e 2018metric tons CO2e 2017metric tons CO2e
Revenue ton-mile (RTMs – millions)2 26,672 25,949 24,796
Metric tons CO2e/1,000 RTMs2 1.333 1.289 1.321
Available seat-miles (ASMs)3 284,999 275,262 262,386
Metric tons CO2e/1,000 ASMs3 151.2 145.7 147.6
Energy consumption
2019 2018 2017
Aircraft (Mainline jet fuel – millions of gallons) 3,562 3,445 3,357
Aircraft (Mainline sustainable aviation fuel – millions of gallons) 1 1 1
Aircraft (regional jet fuel – millions of gallons) 729 691 621
Electricity (MWh) 489,197 459,047 734,864
Natural gas (MM BTUs) 1,432,250 1,541,368 1,475,467

Local air quality

NOx Emissions
2019tons NOx 2017tons NOx 2017tons NOx
NOx emissions 15,166 14,720 14,143
SO2 emissions
2019tons SO2 2017tons SO2 2017tons SO2
SO2 emissions 1,473 1,426 1,366
CO emissions
2019tons CO 2018tons CO 2017tons CO
CO emissions 8,363 8,010 7,478
Waste management
2019metric tons 2018metric tons 2017metric tons
Waste – total 53,832 61,226 63,986
Hazardous and non-hazardous waste generation 26,621  28,075 36,874
Catering – Municipal waste 27,210 33,151 27,112
Recycling – total 8,332 9,318 10,307
Non-catering – recycled 4,489 5,046 6,618
Catering – recycled 3,843 4,272 3,689
Water consumption
2019millions of gallons 2018millions of gallons 2017millions of gallons
Billed water consumption4 521 532 453

Footnotes

  1. United's sustainable aviation fuel in 2017 was comparable to 2016, but no savings were claimed as United's World Energy supplier achieved certification for their lifecycle emissions reduction
  2. Scope 1+2 emissions/Mainline RTMs; metric used for tracking progress against industry goal of 1.5%/year efficiency improvement
  3. Scope 1+2+3 Regional emissions/Mainline+Regional ASMs; metric used for tracking progress against Global Performance Commitment
  4. Does not account for all United locations or locations shared with other businesses (e.g., terminals) and as a result may change considerably from year to year

Totals may not add up due to rounding.