The figure shows a bar chart with five horizontal bars illustrating the typical CO₂ emissions in grams per tonne kilometre in 2009. The upper bar shows that very large container vessels emit 3 grams per tonne kilometre; the bar below that shows that oil tankers emit 5.9 grams per tonne-kilometre; the bar below that shows that bulk carriers emit 7.9 grams per tonne kilometre; the bar below that shows that trucks emit 80 grams per tonne-kilometre; and the lowest bar shows that air freight emits 435 grams per tonne-kilometre.