TABLE 9.

Cars and light-truck GHG breakdown by cause.

Emission sourcePercent of total car/truck emissions
Tailpipe CO2 (no AC)88.6
Coolant leakage5.1
CO2 from AC (excluding leakage)3.9
N2O2.3
CH40.2

Source: Final Rulemaking to Establish Light-Duty Vehicle Greenhouse Gas Emission Standards and Corporate Average Fuel Economy Standards, 2-4, Table 2-1.