Relative CO2 emissions from transport have risen rapidly in recent years, from 21% of the total in 1990 to 28% in 2004, but currently there are no standards for limits on CO2 emissions from vehicles.
道路運輸的二氧化碳的排放量逐年增加，由1990年的21%新增至2004年的28%，但目前並沒有車輛排放二氧化碳的標準。