<h1>Global carbon tax on shipping requires ships to use cleaner fuels or pay emissions based fees, with revenues ring fenced.</h1> The IMO has adopted a global carbon tax on shipping requiring ships to shift to lower emission fuels or pay emissions based fees calculated by emissions intensity; the system uses staged pricing with differentiated per tonne rates for the most polluting emissions and for emissions exceeding thresholds, and all revenues are to be ring fenced for maritime decarbonisation, with technical details and revenue distribution to be finalised before formal adoption.