Ignoring this low figure for deliveries, 70.848 tonnes/week of MGO produces 227.139 tonnes of CO per week, 11,356.93 tonnes in an operating year of 2 50 weeks, or 340,707.9 tonnes in a 30-year life. 4.2 Once emitted, each year’s quantum of CO does not go away but hangs in the atmosphere with its 2 GWP being increased by quanta in other years for the operating life of the vessel, ie 30+29+28+27+26….. +3+2+1 years. This rolling total is 455 years in a 30-year operating life.