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Breakdown of CO2 emissions in the transportation sector worldwide 2018, by subsector

The global transport sector is a major polluter, and was responsible for approximately eight billion metric tons of carbon dioxide emissions in 2018. Passenger road transport such as cars and buses were the biggest contributors that year, having produced roughly 45 percent of all transport emissions. Road transport accounts for 12 percent of the total greenhouse emissions worldwide.

Distribution of carbon dioxide emissions produced by the transportation sector worldwide in 2018, by subsector*

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Release date

June 2020



Survey time period


Special properties

Based on 2018 transportation sector emissions of 8 billion metric tons

Supplementary notes

*Road (passenger) includes cars, motorcycles, buses, and taxis; Road (freight) includes trucks and lorries; Aviation includes passenger and freight; Other includes transport of oil, gas, water, steam and other materials via pipelines.

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Statistics on "Greenhouse gas emissions worldwide"

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