According to the International Maritime Organization
(IMO), shipping was estimated to have accounted
For 3.3 per cent of the global emissions during 2007.
International shipping was estimated to be responsible
For 2.7 per cent of the global emissions of CO2 in 2007. In
the absence of global policies to control emissions from
international shipping, ship emissions may increase
by 200-300 per cent by the year 2050 (compared to
the emissions in 2007) due to the expected continued
growth in international seaborne trade.